Not just that but from a pollution point of view burning used cooking oil and engine oil in controlled conditions in an incinerator to produce electricity to power EVs is likely to produce a lot less harmful by products.So when you said
did you mean that some 'alternative fuels' were fossil fuels, like engine oil and petrol? In what sense are they 'alternative'? I thought the whole point of 'alternative fuels' was they were an alternative to fossil fuels.