Adblue - How far are you getting?

[Tio64]

Adblue - what a major pain in the backside this stuff is. We took delivery of a brand new moho last November and it's the first vehicle I've had which is equipped with an adblue system.

So far we're only getting @ 1500 miles between the adblue light coming on. Our Fiat Ducato base has no gauge, just a light. The price of adblue seems to have doubled in recent days, I've just paid £20 for 10 litres, I can't find any of those £1 a litre deals.
A local garage has adblue pumps, £1.79 a litre, but the diesel there is not cheap, so do I drive from one fuel station to another?

Another absolute PITA is the addition of an adblue tank to the vehicle has reduced diesel capacity to 60 litres, meaning a fuel range of under 250 miles, a pita on long journeys.

Talking to friends who have cars with adblue, they're saying the never have to top it up. One handbook I've seen says the adblue is topped up at the annual service. Why am I having to top up on journeys?

What's your experience folks, how many miles are you doing between adblue top ups?

Mike

 

[RV72 SAM 🏴]

Sorry John No, a bit new to this, it was for ontheroadagain with the Adria Compact !

 

[ontheroadagain]

it was for ontheroadagain with the Adria Compact !

Our Fiat/Adria was built mid 2021 (2.3L 140hp) and uses approx. 4L of Adblue per 1000 miles.

 

[BikerGraham]

My 2017 Elddis on Peugeot base and 2.0lit engine has 15lit adblue tank and has done about 600m/lit fairly consistently since new. First warning's apparently at 1500 miles/4lit (?), so should be about 6600m range on a tank. After reading this thread I'm now worried it's not using enough...

my Bailey light came on, on way back from colleting it from the dealer last year. It had done 7700 miles when the light came on.

So topped up and took 10 litres to the pump click.

It has now done 12300 miles and as going to France in a couple of weeks thought best to top up just in case. It took 8.3 litres till the pump clicked off. So 4600 miles for 8.3 litres.

Happy with that. The refill light comes on with around 1500 miles left apparantly.

 

[Jo and Jen]

Adblue - what a major pain in the backside this stuff is. We took delivery of a brand new moho last November and it's the first vehicle I've had which is equipped with an adblue system.

So far we're only getting @ 1500 miles between the adblue light coming on. Our Fiat Ducato base has no gauge, just a light. The price of adblue seems to have doubled in recent days, I've just paid £20 for 10 litres, I can't find any of those £1 a litre deals.
A local garage has adblue pumps, £1.79 a litre, but the diesel there is not cheap, so do I drive from one fuel station to another?

Another absolute PITA is the addition of an adblue tank to the vehicle has reduced diesel capacity to 60 litres, meaning a fuel range of under 250 miles, a pita on long journeys.

Talking to friends who have cars with adblue, they're saying the never have to top it up. One handbook I've seen says the adblue is topped up at the annual service. Why am I having to top up on journeys?

What's your experience folks, how many miles are you doing between adblue top ups?

Mike

looking through my notes since I was disappointed at the rate of which I was adding the blue stuff to my vehicle from a new purchase Jan 2021. Read on to see Fiats consumption figures before they decide to investigate under warranty.
Tank size 19 . 5 Ltrs, and Fiat say they expect the light first orange warning light to come on after approx 1500 from full. When the first orange warning light comes on you have approx 370 miles before the 2nd light appears, believed red. This has a further approx 120 miles . IT WILL NOT RUN AFTER THIS .
Therefore it appears that 19-5 litres will last approx 1950 mile SO = 100mls / ltr.
Note, the light came on when travelling to Anglesey and I thought at least 5 Ltrs was added . This only lasted approx 350 miles before it came on again so at 4340 I added 10Ltrs.
Based on the above calculations and the fact that I put 10Ltrs in at 4340 miles I expect the first orange light to come on at 5340 miles . This adblue cost £2 / ltr at Halfords June 2022.
10
009.20
Date 25/05/2021 Esc. 2782
DUCATO (290/295) – UREA DOSING CONTROL UNIT (DCU)
Urea consumption – Network Information
APPLICABILITY
2.3 Mjet Euro 6D Temp
Cancels and replaces SN 10,009.20 of 12/06/2020
CLAIMED FAULT
The customer complains of excessive urea consumption.
The customer complains of the appearance of an inducement message without an indication of the kilometers on the instrument panel after adding urea.
GENERAL INFORMATION
The Ducato has a 19 liter urea reservoir.
The indicative urea consumption for each type of route in ordinary driving conditions is:
Indicative urea consumption (litres/1000km)
Version
Urban
Extra- urban
Motorway
Mixed route (average)
Van / Panorama
Up to 2.0
Up to 2.0
Up to 6.0
3.0
Camper / Motorhome
Up to 2.5
Up to 2.5
Up to 7.0
4.0
Insulated with refrigerator box
Up to 3.5
Up to 3.5
Up to 9.0
5.5
Evidently, these values may be strongly influenced by the type of route (urban/extra urban/highway/mountain roads), but also driving style, load and environmental conditions. At high speed (e.g. 150km/h, speed allowed on some motorways in
1

Germany) or transients at full load, consumption may increase even more than that shown in the table. An urban driving mission characterized by sudden accelerations, for example, would require more work by the system to abate pollutants with consequent increase in urea consumption with respect to the values given above.
Additional considerations:
● Some customers who already had E6b vehicles with a urea injection system could complain of excessive consumption in comparison with the previous emissions standard. Refer to the values provided previously and explain how the tightening of the standard has required greater urea use.
● The appearance of the message on the panel (“inducement”) is initially only a warning and does not indicate the residual range of urea. When the customer has only the message, the range is between 600 and 1500km (depending on when the message appeared the first time). As the range decreases, the residual kilometers appear that, once driven, prevent the vehicle from being started.
The message is not related to the effective quantity of urea in the reservoir, but the estimate of the residual kilometer range.
High urea consumption due to the combination of high speed/particular versions can lead to the message ("inducement" without the indication of kilometers) appearing on the panel also after filling up the reservoir completely.
● The system is able to diagnose abnormal urea consumption related to a possible malfunction, displaying the suitable error code. If there is no error code, the message on the panel is related to the estimate of the residual kilometer range and not to malfunctions; therefore no components require replacement.
The average urea consumption from the beginning of life car can be calculated using the diagnostic tool as described below.
• Using the diagnostics tool updated to the most recent software release, access vehicle view, select the urea system control module (DCU – Dosing Control Unit) and open the Data tab.
• On the Data tab, select the "Total consumed urea" item to display a value that indicates how many grams of urea have been consumed since the beginning of the car's life
• To determine the value in litres, divide the value in grams by 1.087 (specific weight of urea) and divide the result by 1000.
• To determine the average urea consumption expressed in liters/1000km, divide the previously obtained value in liters by the total kilometers driven by the vehicle
Example
For a vehicle with total of 11200 km and value of 30436 grams detected with the diagnostic tool, the result is:
• Total of 28 litres of urea consumed since the beginning life car (30436 divided by 1.087, and the result divided again by 1000).
• Average consumption of 2.5 litres of urea times 1000 km (28 times 1000 divided by 11200).
2

10
009.20
Date 25/05/2021 Esc. 2782
DUCATO (290/295) – UREA DOSING CONTROL UNIT (DCU)
Urea consumption – Network Information
APPLICABILITY
2.3 Mjet Euro 6D Temp
Cancels and replaces SN 10,009.20 of 12/06/2020
CLAIMED FAULT
The customer complains of excessive urea consumption.
The customer complains of the appearance of an inducement message without an indication of the kilometers on the instrument panel after adding urea.
GENERAL INFORMATION
The Ducato has a 19 liter urea reservoir.
The indicative urea consumption for each type of route in ordinary driving conditions is:
Indicative urea consumption (litres/1000km)
Version
Urban
Extra- urban
Motorway
Mixed route (average)
Van / Panorama
Up to 2.0
Up to 2.0
Up to 6.0
3.0
Camper / Motorhome
Up to 2.5
Up to 2.5
Up to 7.0
4.0
Insulated with refrigerator box
Up to 3.5
Up to 3.5
Up to 9.0
5.5
Evidently, these values may be strongly influenced by the type of route (urban/extra urban/highway/mountain roads), but also driving style, load and environmental conditions. At high speed (e.g. 150km/h, speed allowed on some motorways in
1

Germany) or transients at full load, consumption may increase even more than that shown in the table. An urban driving mission characterized by sudden accelerations, for example, would require more work by the system to abate pollutants with consequent increase in urea consumption with respect to the values given above.
Additional considerations:
● Some customers who already had E6b vehicles with a urea injection system could complain of excessive consumption in comparison with the previous emissions standard. Refer to the values provided previously and explain how the tightening of the standard has required greater urea use.
● The appearance of the message on the panel (“inducement”) is initially only a warning and does not indicate the residual range of urea. When the customer has only the message, the range is between 600 and 1500km (depending on when the message appeared the first time). As the range decreases, the residual kilometers appear that, once driven, prevent the vehicle from being started.
The message is not related to the effective quantity of urea in the reservoir, but the estimate of the residual kilometer range.
High urea consumption due to the combination of high speed/particular versions can lead to the message ("inducement" without the indication of kilometers) appearing on the panel also after filling up the reservoir completely.
● The system is able to diagnose abnormal urea consumption related to a possible malfunction, displaying the suitable error code. If there is no error code, the message on the panel is related to the estimate of the residual kilometer range and not to malfunctions; therefore no components require replacement.
The average urea consumption from the beginning of life car can be calculated using the diagnostic tool as described below.
• Using the diagnostics tool updated to the most recent software release, access vehicle view, select the urea system control module (DCU – Dosing Control Unit) and open the Data tab.
• On the Data tab, select the "Total consumed urea" item to display a value that indicates how many grams of urea have been consumed since the beginning of the car's life
• To determine the value in litres, divide the value in grams by 1.087 (specific weight of urea) and divide the result by 1000.
• To determine the average urea consumption expressed in liters/1000km, divide the previously obtained value in liters by the total kilometers driven by the vehicle
Example
For a vehicle with total of 11200 km and value of 30436 grams detected with the diagnostic tool, the result is:
• Total of 28 litres of urea consumed since the beginning life car (30436 divided by 1.087, and the result divided again by 1000).
• Average consumption of 2.5 litres of urea times 1000 km (28 times 1000 divided by 11200).
2
10
009.20
Date 25/05/2021 Esc. 2782
DUCATO (290/295) – UREA DOSING CONTROL UNIT (DCU)
Urea consumption – Network Information
APPLICABILITY
2.3 Mjet Euro 6D Temp
Cancels and replaces SN 10,009.20 of 12/06/2020
CLAIMED FAULT
The customer complains of excessive urea consumption.
The customer complains of the appearance of an inducement message without an indication of the kilometers on the instrument panel after adding urea.
GENERAL INFORMATION
The Ducato has a 19 liter urea reservoir.
The indicative urea consumption for each type of route in ordinary driving conditions is:
Indicative urea consumption (litres/1000km)
Version
Urban
Extra- urban
Motorway
Mixed route (average)
Van / Panorama
Up to 2.0
Up to 2.0
Up to 6.0
3.0
Camper / Motorhome
Up to 2.5
Up to 2.5
Up to 7.0
4.0
Insulated with refrigerator box
Up to 3.5
Up to 3.5
Up to 9.0
5.5
Evidently, these values may be strongly influenced by the type of route (urban/extra urban/highway/mountain roads), but also driving style, load and environmental conditions. At high speed (e.g. 150km/h, speed allowed on some motorways in
1

Germany) or transients at full load, consumption may increase even more than that shown in the table. An urban driving mission characterized by sudden accelerations, for example, would require more work by the system to abate pollutants with consequent increase in urea consumption with respect to the values given above.
Additional considerations:
● Some customers who already had E6b vehicles with a urea injection system could complain of excessive consumption in comparison with the previous emissions standard. Refer to the values provided previously and explain how the tightening of the standard has required greater urea use.
● The appearance of the message on the panel (“inducement”) is initially only a warning and does not indicate the residual range of urea. When the customer has only the message, the range is between 600 and 1500km (depending on when the message appeared the first time). As the range decreases, the residual kilometers appear that, once driven, prevent the vehicle from being started.
The message is not related to the effective quantity of urea in the reservoir, but the estimate of the residual kilometer range.
High urea consumption due to the combination of high speed/particular versions can lead to the message ("inducement" without the indication of kilometers) appearing on the panel also after filling up the reservoir completely.
● The system is able to diagnose abnormal urea consumption related to a possible malfunction, displaying the suitable error code. If there is no error code, the message on the panel is related to the estimate of the residual kilometer range and not to malfunctions; therefore no components require replacement.
The average urea consumption from the beginning of life car can be calculated using the diagnostic tool as described below.
• Using the diagnostics tool updated to the most recent software release, access vehicle view, select the urea system control module (DCU – Dosing Control Unit) and open the Data tab.
• On the Data tab, select the "Total consumed urea" item to display a value that indicates how many grams of urea have been consumed since the beginning of the car's life
• To determine the value in litres, divide the value in grams by 1.087 (specific weight of urea) and divide the result by 1000.
• To determine the average urea consumption expressed in liters/1000km, divide the previously obtained value in liters by the total kilometers driven by the vehicle
Example
For a vehicle with total of 11200 km and value of 30436 grams detected with the diagnostic tool, the result is:
• Total of 28 litres of urea consumed since the beginning life car (30436 divided by 1.087, and the result divided again by 1000).
• Average consumption of 2.5 litres of urea times 1000 km (28 times 1000 divided by 11200).
2
10
009.20
Date 25/05/2021 Esc. 2782
DUCATO (290/295) – UREA DOSING CONTROL UNIT (DCU)
Urea consumption – Network Information
APPLICABILITY
2.3 Mjet Euro 6D Temp
Cancels and replaces SN 10,009.20 of 12/06/2020
CLAIMED FAULT
The customer complains of excessive urea consumption.
The customer complains of the appearance of an inducement message without an indication of the kilometers on the instrument panel after adding urea.
GENERAL INFORMATION
The Ducato has a 19 liter urea reservoir.
The indicative urea consumption for each type of route in ordinary driving conditions is:
Indicative urea consumption (litres/1000km)
Version
Urban
Extra- urban
Motorway
Mixed route (average)
Van / Panorama
Up to 2.0
Up to 2.0
Up to 6.0
3.0
Camper / Motorhome
Up to 2.5
Up to 2.5
Up to 7.0
4.0
Insulated with refrigerator box
Up to 3.5
Up to 3.5
Up to 9.0
5.5
Evidently, these values may be strongly influenced by the type of route (urban/extra urban/highway/mountain roads), but also driving style, load and environmental conditions. At high speed (e.g. 150km/h, speed allowed on some motorways in
1

Germany) or transients at full load, consumption may increase even more than that shown in the table. An urban driving mission characterized by sudden accelerations, for example, would require more work by the system to abate pollutants with consequent increase in urea consumption with respect to the values given above.
Additional considerations:
● Some customers who already had E6b vehicles with a urea injection system could complain of excessive consumption in comparison with the previous emissions standard. Refer to the values provided previously and explain how the tightening of the standard has required greater urea use.
● The appearance of the message on the panel (“inducement”) is initially only a warning and does not indicate the residual range of urea. When the customer has only the message, the range is between 600 and 1500km (depending on when the message appeared the first time). As the range decreases, the residual kilometers appear that, once driven, prevent the vehicle from being started.
The message is not related to the effective quantity of urea in the reservoir, but the estimate of the residual kilometer range.
High urea consumption due to the combination of high speed/particular versions can lead to the message ("inducement" without the indication of kilometers) appearing on the panel also after filling up the reservoir completely.
● The system is able to diagnose abnormal urea consumption related to a possible malfunction, displaying the suitable error code. If there is no error code, the message on the panel is related to the estimate of the residual kilometer range and not to malfunctions; therefore no components require replacement.
The average urea consumption from the beginning of life car can be calculated using the diagnostic tool as described below.
• Using the diagnostics tool updated to the most recent software release, access vehicle view, select the urea system control module (DCU – Dosing Control Unit) and open the Data tab.
• On the Data tab, select the "Total consumed urea" item to display a value that indicates how many grams of urea have been consumed since the beginning of the car's life
• To determine the value in litres, divide the value in grams by 1.087 (specific weight of urea) and divide the result by 1000.
• To determine the average urea consumption expressed in liters/1000km, divide the previously obtained value in liters by the total kilometers driven by the vehicle
Example
For a vehicle with total of 11200 km and value of 30436 grams detected with the diagnostic tool, the result is:
• Total of 28 litres of urea consumed since the beginning life car (30436 divided by 1.087, and the result divided again by 1000).
• Average consumption of 2.5 litres of urea times 1000 km (28 times 1000 divided by 11200).
2

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[h8ten]

My 2021 Mer based has covered 3,700 miles and is still around 60% - 70% full according to the gauge.

 

[Blofeld]

My 2022 Ducato just changed to half full on the digital gauge 2500 miles after the last fill up. It took 10 litres exactly

 

[Adamwallace]

Adblue - what a major pain in the backside this stuff is. We took delivery of a brand new moho last November and it's the first vehicle I've had which is equipped with an adblue system.

So far we're only getting @ 1500 miles between the adblue light coming on. Our Fiat Ducato base has no gauge, just a light. The price of adblue seems to have doubled in recent days, I've just paid £20 for 10 litres, I can't find any of those £1 a litre deals.
A local garage has adblue pumps, £1.79 a litre, but the diesel there is not cheap, so do I drive from one fuel station to another?

Another absolute PITA is the addition of an adblue tank to the vehicle has reduced diesel capacity to 60 litres, meaning a fuel range of under 250 miles, a pita on long journeys.

Talking to friends who have cars with adblue, they're saying the never have to top it up. One handbook I've seen says the adblue is topped up at the annual service. Why am I having to top up on journeys?

What's your experience folks, how many miles are you doing between adblue top ups?

Mike

I agree with other posts. I have a 2018 Peugeot Boxer, and get about 5000 miles per adblue fill-up.

 

[Apacheman]

Our base is a Ducato 2.3 Multijet 140bhp. Normally get about 2000 miles from 10 litres. That’s all it takes once the warning light comes on so approx 200 mpl. Think it must be a 12L tank. Normally buy 10L containers from Aldi for around £16. Currently in Spain where we filled at a pump for €0.98 a litre. Did see it cheaper than that but the warning light hadn’t come on.

 

[andymun]

I agree with the OP. I had a 2021 Fiat Ducato base vehicle. The adblue light would come on after about 1500 miles which was a pain. You have to fill up although it never took more than 10 litres depending on how long I left it. The tank is supposed to be 20 litres.

That was one of the reasons I got rid of the Fiat.

I've got a Ford Transit Custom based camper van now which runs over 6000 miles on adblue between fill ups.

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[h8ten]

I've just checked the handbook for the Merc and it is 22-litre capacity for the AdBlue. Diesel tank can be 50, 65, 71, 92 or even 93-litre capacity.

 

[yellowcarnoreturn]

Adblue - what a major pain in the backside this stuff is. We took delivery of a brand new moho last November and it's the first vehicle I've had which is equipped with an adblue system.

So far we're only getting @ 1500 miles between the adblue light coming on. Our Fiat Ducato base has no gauge, just a light. The price of adblue seems to have doubled in recent days, I've just paid £20 for 10 litres, I can't find any of those £1 a litre deals.
A local garage has adblue pumps, £1.79 a litre, but the diesel there is not cheap, so do I drive from one fuel station to another?

Another absolute PITA is the addition of an adblue tank to the vehicle has reduced diesel capacity to 60 litres, meaning a fuel range of under 250 miles, a pita on long journeys.

Talking to friends who have cars with adblue, they're saying the never have to top it up. One handbook I've seen says the adblue is topped up at the annual service. Why am I having to top up on journeys?

What's your experience folks, how many miles are you doing between adblue top ups?

Mike

You’re lucky with 1500 ours comes on at approx 360 miles. It drives me mad.

 

[Peter_Cooke]

From new we have used 117.41 litres[25.83 gallons] of AdBlue covering 37682 miles giving 1458 mpg over six years with a Renault Master 2.3 litre turbo diesel engine. Over 75% of the miles have been in Europe at a maximum of 89 kmph.

 

[Tio64]

From new we have used 117.41 litres[25.83 gallons] of AdBlue covering 37682 miles giving 1458 mpg over six years with a Renault Master 2.3 litre turbo diesel engine. Over 75% of the miles have been in Europe at a maximum of 89 kmph.

Hmm, maybe that's what we've got to look forward to.

 

[Gunnster]

My 72 plate ducato 2.2 140 is at 1850 miles so far not required adblue

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[InvictaMoto]

I had better top mine up. It was filled around 1700 miles ago on March 27th. I've not had a light come on at all yet... 19 Boxer Elddis 175.

 

[Jez1966]

Quite test , after 1st warning I, immediately, put in 5l and covered 1000 miles before warning came on again.
So approx 1 litre per 1000 miles.
2021 Ducato 2.3 160BHP Maxi Swift Kon-Tiki 599 Sport 4250kgs
95% 50 - 60 open road driving.

 

[ontheroadagain]

So approx 1 litre per 1000 miles.

???

 

[RV72 SAM 🏴]

I can't see mine doing any more than 3,000 miles on 20 litres, after just emptying a 10 litre bottle in after 1,431 miles, now reading full again on guage Also a litre of oil which is absolutely pants for running cost's. This had better improve else my supplying dealer will be getting a roasting as not been on the road 6 months yet !

 

[Al n Val]

Quite test , after 1st warning I, immediately, put in 5l and covered 1000 miles before warning came on again.
So approx 1 litre per 1000 miles.
2021 Ducato 2.3 160BHP Maxi Swift Kon-Tiki 599 Sport 4250kgs
95% 50 - 60 open road driving.

Isn’t that 5ltrs per 1000miles or have my maths gone up the spout

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[Frankvmax]

A few guys from work with cars has had the ad blue coded out mot guys don't know

 

[VXman]

I agree with the OP. I had a 2021 Fiat Ducato base vehicle. The adblue light would come on after about 1500 miles which was a pain. You have to fill up although it never took more than 10 litres depending on how long I left it. The tank is supposed to be 20 litres.

That was one of the reasons I got rid of the Fiat.

I've got a Ford Transit Custom based camper van now which runs over 6000 miles on adblue between fill ups.

The warming light come on very early on the Fiat. It may come on after 10 litres but th tank holds about 19 I think. Therefore you have a long time to fill it. It will probably work out the same as the Transit.

 

[Jez1966]

Isn’t that 5ltrs per 1000miles or have my maths gone up the spout

Sorry yes 1l per 200 miles
I was expecting it to be 3%, 5% is larger diesel vehicle value according to some documents I found before but can't find again.

 

[andykim]

AD BLUE to save the environment? Have you noticed how many containers are thrown into hedges and at the side of the roads!! I'm assuming ad blue is mostly water so why doesnt someone come up with ad blue concentrate to add to a 10ltr cannister ??? %67 de-ionised water, I just checked.

 

[RV72 SAM 🏴]

Light came on at 1431 miles from new, but who's to say it was full Dealer's don't rim anything do they???
So showing half a tank and just put 10 ltrs but showed full with 8 ltrs, so there's a 2 ltr margin, although still not rimmed, so thinkiin only had approx 16-17 ltrs from new. Am I correct presuming there's now around 19 ltrs in tank, this should get 3,000-3,500 miles to empty, is this acceptable, not really

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[andymun]

The warming light come on very early on the Fiat. It may come on after 10 litres but th tank holds about 19 I think. Therefore you have a long time to fill it. It will probably work out the same as the Transit.

Yes agreed, that seems right. I did leave it for a few hundred miles without any problems. Only trouble is that you don't know how much is left.

I've got a feeling that the Fiat's use a lot more than the Transit though. I've just done a 1000 miles and the Ford app is showing 5500 miles left.

 

[RV72 SAM 🏴]

I'm not sure you should ever delete the adblue, but why can't it be recalibrated to use less fluid. My pal ran out after 3k in Europe, his own fault really, as what with a level guage and warning light it should never be ignored. 2022 Ducato Euro 6 like mine, so definitely no excuse

 

[andymun]

I think the problem with the Fiat is the warning light comes on early. After that there's not way to be sure of the level.

 

[RV72 SAM 🏴]

They have a guage on the new model black dash binnacle so you can see the exact level 2022 onwards . . .

 

[KD]

It looks like you are doing better than us then. Since the next trip will be a long drive, decided to fill up last weekend whilst at a garage with a pump. We had done 1,305 miles since we collected our MH (coachbuild Fiat 140 auto) when the dealer filled the AdBlue tank up, and it took 6.34 litres. I guess that will put us in their estimated 2-3,000 miles per tank (judging by the tank size estimates above) range then.

Quick update, I've added up all of the fills since this post, and as of out last we seem to be averaging 198 miles per litre (2021 Ducato 140 9sp auto coachbuilt)

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[Blofeld]

The point of Euro 6 and the rest of them is to reduce the pollution from internal combustion engines. The number of people, especially children, with asthma has been rising sharply while air quality in many cities is poor, often illegally poor. My children and grandchildren all live in cities and I prefer not to contribute to their being poisoned.