Drag coefficient, frontal area, and drag area for 92 Civic CX/VX vs CRX:
CRX HF: .27 Cd, 14sq feet, 3.78 CdA
VX/CX: .36Cd, 20.56sq feet, 7.4 CdA
That's a 51% reduction in drag over the VX shell... And a few hundred pounds. Think a undertray, wheel skirts, grille block, and other sane aeromods can get that to .2Cd?
That would be a drag area of 2.8sqft, or only .3 more than a Twike (2.5) and plenty less than a EV1 (3.95)
Horsepower required for level ground cruising at, say, 70mph? Assuming low rolling resistance tires of course: Stock crx drag, 11.3hp. With a (probably optimistic) .2Cd, 8.75hp
CX/VX hp for 70 stock: 20.59hp.
Real tempting to shove a little 30hp turbocharged kubota diesel in it and shoot for insane mileage... but much more work, and those things are hard to find >.<
Dalez0r 
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