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Old 02-06-2006, 09:25 PM   #5
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Re: Gas Mileage myths or facts?

On the average, A/C for larger cars takes as much as 15 hp to run. That means you have to put that much more "foot" into it to maintain speed or to accelerate with the same force you're used to.

Overdrive does drop RPM, but lower RPMs aren't necessarily always better. Different engines have different peak cruise efficiency points. An overdrive on an already high-geared vehicle will cause the engine to lug down requiring more foot to maintain speed. For the most part, the manufacturers do a relatively decent job of finding a good cruise RPM, but sometimes they go a touch on the conservative side (RPMs too low)
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