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Old 11-20-2007, 08:39 PM
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Join Date: Jun 2002
Location: Auburn, WA
Posts: 1,194
The guy has got to be using special filtration and a preheater to run straight veggie oil in that engine. You could probably run straight biodiesel in it, but biodiesel is NOT the same as vegetable oil. There's a lot more to making biodiesel then pouring used vegetable oil through a pair of blue jeans. Natural gas, or more commonly used propane injection can make more power, sort of like using nitrous on a gas engine. Maybe it will improve your fuel mileage, but definitely not your fuel economy. When you factor in the cost of the gas injection system plus the cost of the CNG or propane itself, those costs will more than eat up any gain you get in fuel mileage.
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