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Most bike engines are biased towards ultimate output (higher rpm hp rather than lower rpm torque) than economy and it seems they return econo not as good as we'd hope for when repurposed. Still, they can be made to work and I'm sure some are better than others. So after all my blather I guess I don't have direct experience with the options you listed... whichever one is more of a "torque" engine will probably give better fe.
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