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Cd: the main issue is that you can't compare EPA ratings against readings taken at a constant speed. (Even considering the Aerocivic has a drivetrain that the EPA never tested in the first place, as Mike points out.)
The EPA's "highway" fuel economy rating is actually an entire simulated "trip" - from rest, then varying "highway" speeds (up and down, in a range from 30-60 mph), and then to rest again.
Comparing that rating to actual MPG @ some steady speed is apples to oranges.
I'd even say that most cars will significantly exceed their EPA highway ratings where MPG is measured at a steady 60 mph.
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