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My point was the difference that 10mph would make WOULD NOT ACCOUNT for the 15% improvement in fuel economy (note NOT a 15% improvement in aero but in MPG)
ie inability to maintain speed would not be a valid reason to disregard his improvements since even a speed delta much greater that what he had (I chose 10mph) would not account for a 15% improvement in mpg
in my metro slowing down from say 45mph to 35mph WOULD NOT net me 15% improvement in mpg. 2 or 3% maybe.
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