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Old 12-17-2008, 02:00 PM   #8 (permalink)
PaleMelanesian
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Join Date: Dec 2007
Location: Texas
Posts: 2,321

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
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90 day: 44.06 mpg (US)
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Unless the transmission free-wheels when you let off the gas, and drops to idle rpm, you're wasting your time trying P&G in gear. DWL / steady speed is better. The momentum lost due to engine braking in gear is more than the gains. If it does free-wheel, then your job is easy. GM transmissions are good about this. Honda's are bad - they hold the gear and engine-brake your momentum into oblivion.

You will NOT damage the transmission by shifting it into neutral with the engine running. EOC might, but check your manual for flat-towing instructions.

Also, the higher your speeds, the smaller the benefit you'll see from P&G. 70 is too fast. Consider that the aerodynamic drag increases with the square of your speed. Your glides will be more like "plummets", instead.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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