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Old 08-15-2011, 08:33 PM   #4 (permalink)
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Join Date: Feb 2011
Location: Phillips, WI
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Nameless - '06 GMC Canyon
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Gasoline has about 128,000 BTU's per gallon, while propane has only 92,000. On the other hand, propane is 110 octane. Propane will get fewer miles per gallon, but could get more miles per BTU if the engine is knock limited.
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