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Old 05-04-2012, 01:00 AM   #2 (permalink)
EcoModding Apprentice
Join Date: Jan 2008
Location: SF Bay Area
Posts: 150

Silver Bullet - '02 VW Golf TDi
Thanks: 5
Thanked 16 Times in 11 Posts
Maybe it's because fuel in an ICE is metered by weight, not volume. Propane has about 22,000 btu/lb, whereas gasoline has about 17,5000 btu/lb. Or maybe it's because gasoline engines chill the incoming air charge through evaporative cooling, while propane is already vaporized before being mixed with the air.
Best tank ever: 72.1 mpg in February 2005, Seattle to S.F.
New personnal best 'all-city' tank June '08 ... 61.9 mpg!
Thanks to 'pulse-n-glide' technique.
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