[aerohead]

From Dr. Gino Sovran's, 'Change in fuel economy from a prescribed percentage change in CdA for a representative automobile...', SAE Paper 830304, Feb.28-Mar. 4, 1983, Fig.-3, pg. 7:
I did an extrapolation of his drag table, and it looks like, if one were to get into the weeds, streamlining the Chevette into 'Hucho-territory' ( Cd 0.133 ), you might experience a 72% drag reduction, and 68-mpg HWY, based on the old 55-MPH National Speed Limit, according to the GM Research Laboratories.
All variables held constant, except CdA.
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