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Once thing about small engines and gasoline, and part of the reason I'm leaning towards making my own propane engine, is that gasoline does not like to burn at a stoichiometric AFR at full throttle. If a 30hp motorcycle engine is pushing a car as big as a Leaf at highway speeds it would have to be turning at full speed in order to get 66% load. That's close enough the engine may have to turn to high load (and in some engines, high speed) enrichment most, if not all the time, which would render the catalytic converter inoperative and produce much more CO and HC emissions. The best way to do gasoline would be a car sized engine running at part throttle and low RPM's.
Propane burns cooler and is more resistant to detonation. As result stoichiometric operation at high load should be much more possible to attain with a small propane engine.
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