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Ok, this is confusing, first run on the way to town (with 147lbs of weights added) 57.7mpg, no way that's right.
Second run after town trip (car warm) 63.3mpg.
My guess is that the higher 62.5mpg 'with' number is from a short warmup time (sorry, mom insists) and the lower 57.7mpg 'without' number is from no warmup time.
so to approximate, lets add the 2 'withouts' together (warm car # +cold car #)=61mpg
61mpg appx. without air dam
62.5mpg with air dam
appx. 2.4% improvement with air dam
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"Ignorance is bliss, but only for the ignorant"-Hypermiler1995
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