You can look at the Edison2 VLC for info on this: a 4 seat, 830 pound curb weight, very low drag (Cd 0.164) had a 250cc turbo charged single cylinder engine. It got ~110MPGe (burning E85) on the EPA Combined test; which is impressive.
The Electric VLC got ~245MPGe with a DC motor, which is even more impressive. It is also a lot quicker and much, much quieter.
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