01-16-2011, 10:24 PM
Hi,
Basically, it is incorrect. As you discovered, different cars behave differently. Different drag coefficients, different gear ratios, different power curves, etc. I had a '66 Austin-Healey 3000 Mk3. It got its best gas mileage (25 mpg) at 4000 rpm in 4th gear overdrive. That worked out to 88 mph. At 55 mph (2500 rpm 4/OD), I would barely get 20 mpg, and in city driving, that dropped to about 15.
--Pete
(01-16-2011, 08:51 PM)MEAT Wrote: ... the best MPG you can achieve for your money is 55-MPH, but that info is either outdated, or incorrect ...
Basically, it is incorrect. As you discovered, different cars behave differently. Different drag coefficients, different gear ratios, different power curves, etc. I had a '66 Austin-Healey 3000 Mk3. It got its best gas mileage (25 mpg) at 4000 rpm in 4th gear overdrive. That worked out to 88 mph. At 55 mph (2500 rpm 4/OD), I would barely get 20 mpg, and in city driving, that dropped to about 15.
--Pete
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