I've seen several people slap a diesel generator engine (with a CVT transmission) in an old bike. One of them was a Suzuki, as a matter of fact. As I recall, it got around 115 MPG. The only downside is its max speed was around 55 MPH. Given that diesel bikes get around 25% more gas mileage, and the price of diesel is 25% more than gasoline right now, there really aren't any savings to be had atm.
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