13-02-2023, 11:27 AM
As Colin says, ethanol simply doesn't release as much energy when burned as conventional petrol, so mpg must suffer to a small extent; though in fact E10 is a limit rather than a specification, so there may not be much real difference with present forecourt fuels. I suggest this is the least of our worries. I use whatever comes out of the pump and haven't noticed any issues with my cars.