I dont understand how it couldn't be worth it even at 4-5 bucks per gallon. BioDiesel costs me less than a dollar per gallon to make. Sure there is an initial investment, especially if you get suckered into one of those expensive pre-made processors. But the whole thing should pay for itself within the year!

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1963 Ford F100 - Cummins Swap?
1985 Mercedes 300SD - 210K
1992 Ford Festiva - 92K
2001 Ninja 250 - 8K