There have been reports of E10 affecting fuel performance on older cars. The Department for Transport puts this figure at one or two per cent. However, I have not seen any hard data to back up this claim and some drivers claim E10 uses much more fuel than the old E5 mixture.

That said, new cars are designed for E10 and are WLTP tested with this fuel. Therefore, I would argue that fuel economy and engine performance shouldn't be affected on a 2021 or 2022 model.