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Old 06-08-2009, 07:22 PM   #3 (permalink)
Bicycle Bob
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Join Date: May 2008
Location: N. Saskatchewan, CA
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Appliance White - '93 Metro 4-Dr. Auto
Last 3: 42.35 mpg (US)

Stealth RV - '91 Sprint Base
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It isn't inefficient at low RPMs, just weak, because not much air is flowing through. Try to find some details of load, speed, and efficiency on a graph. As long as you are not blowing black smoke, a diesel is usually pretty good at low speed.
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