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JRMichler · 08-15-2011, 09:33 PM

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.

08-15-2011, 09:33 PM	#4 (permalink)
JRMichler Master EcoModder Join Date: Feb 2011 Location: Phillips, WI Posts: 1,018 Nameless - '06 GMC Canyon 90 day: 37.45 mpg (US) 22 Maverick - '22 Ford Maverick XL 90 day: 43.95 mpg (US) Thanks: 192 Thanked 467 Times in 287 Posts	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.