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Does E10 petrol reduce fuel economy?

The new E10 petrol, that we must now use, do you get less miles per gallon out of it?

Asked on 21 February 2022 by Steve

Answered by Lawrence Allan
The jury's still out on E10 fuel. While the Government's own data suggests it will reduce fuel economy by around 1%, many drivers and independent researchers report the figure at up to 10% for certain engines.

Any new car launched from 2017 or 2018 onwards, however, has been designed for E10 and WLTP tested with it.
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