Is it not true though that both engine and airframe combination needs to be approved for use with MOGAS and the CAA have not come to any conclusion about the use of E5 fuel which effectively prohibits the use of fuel above 1%? Regardless of engine or airframe my current understanding is that if there is more than a trace of Ethanol, we're not supposed to use it
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Not that it stops people and like I say, they're not dropping out of the sky