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Also, most small airports only carry one fuel, i imagine those making new planes don’t get customers excited about planes you cannot take everywhere due to limited availability of fuels.

I love/hate flying for all these reasons.

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Some engines (such as Rotax) can be run on mogas, available at gas stations. Obviously you then need to transport it to the airport yourself, which isn't always convenient.

Doesn't most mogas STC's cover only alcohol-free gas, which AFAIK is increasingly hard to acquire in many places?

It seems that longer term, in many places of the world, particularly outside the US, the answer is diesel aero engines, which can run on jet fuel.

Rotax can run on either MoGas or 100LL, so if you're at an airport that doesn't offer MoGas you can just fill up with AvGas and go.

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