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Cycle engines in general aren't very fuel-efficient for their displacement.
As noted, cycle engines are typically tuned for high power at high revs, and torque usually is not very good compared to the same displacement auto engine. 1000cc sport bikes and 1800cc Goldwings generally produce mileage in the 30 MPG range.
There are some cycles that can do pretty well, like the Ninja 250 and SV 650, but they wouldn't have enough power to move a vehicle of any size. You'd also have some problems running A/C, power steering, and any other accessories.
The little Ninjas usually run in the 70 MPG range, but can hit 90/100 MPG (as seen here).
I have a SV650 that does pretty good by cycle standards (50+ city and 60hwy), but it's pretty lame compared to what some of the vehicles here can do.
Jay
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