Quote:
Originally Posted by Phase
So it seems like lowering a Prius from 6 inches to 4 inches should give about 4 extra mpg on the highway five or take based on all the different studies averaged out
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Since the Audi A2 showed a 'counterfactual, 'black swan', outlier, 'zero' benefit from lowering, nothing about the Prius 2" drop could be predicted with any certainty.
Testing out on the open road leaves you vulnerable to baseline uncertainties, which don't exist in a wind tunnel, or CFD investigations ( $ 4,000 each ).