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Old 03-16-2011, 10:46 PM   #9 (permalink)
Ryland
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Join Date: Jan 2008
Location: Western Wisconsin
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honda cb125 - '74 Honda CB 125 S1
90 day: 79.71 mpg (US)

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I agree, current gasoline engines are around 25% efficient so to make even a 50mpg car get 200mpg you would have to have it be perfect and produce no heat and to prove the point a bit more you can pretty much pick apart each part of a car and say how much fuel that part is using, how much air drag each part causes, how much friction loss you have, so there really are not big unknowns as to why a vehicle uses the amount of fuel that it does.
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