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Old 06-24-2013, 10:54 PM   #7 (permalink)
The road not so traveled
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Join Date: Jan 2010
Location: New Mexico
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The Truck - '99 Nissan Frontier xe
90 day: 25.74 mpg (US)

The Ugly Duck - '84 Jeep CJ7 Rock crawler
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0 vacuum is for all intents and purposes full throttle, maximum dynamic pressure etc.

2400 rpm may very well be where your engine is most efficient at full throttle, where it is more efficient at lower throttles will take time and experimentation. That's why there is a BFSC chart for many engines
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