I am sure it has been mentioned elsewhere on Ecomodder repeatedly, but be sure to check CraigVetter.com for recommendations. Also, the 2014 Honda PCX150 scooter has a fuel-injected water-cooled engine, and stock it already gets a rated 102 mpg, so if your body shell will be ultra aerodynamic (as Craig says, "round in the front, and pointy in the rear"), and you'll be riding one-up, and only want to go 60 mph, I imagine that that scooter's drivetrain would be up to the job.
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