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Old 10-16-2010, 02:03 PM   #3 (permalink)
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4ringcircus's Avatar
Join Date: Oct 2010
Location: Minneapolis
Posts: 31

Ford Ranger - '97 Ford Ranger XLT 4x4
90 day: 21.28 mpg (US)
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Thanks Old Mechanic. I did some errands this morning and find that no matter what gear I am in, if I plan on accelerating and the engine is less than 2200 rpm, I should down shift one or two gears and let the engine scream up to 4000k.

For example, I have always assumed it was most efficient to accelerate with light throttle and shift to maintain a 1200 to 2000 rpm range. When doing this however, the vacuum immediately falls as low as 1 inch. The only way to accelerate and keep it above 1.5 inches is to wind first gear to 3700 rpm then skip to 3rd or 4th gear and maintain speed.

This is the opposite of the old dummy upshift arrow lights; seems completely counter-intuitive. Is this the definition of Power and Glide?
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