I saw in car magazine, a while back, that there were these people driving cross country in a W123 TD running on Hemp oil. Wonder what the exhaust smelled like on that car hmmmmmmmm. I have never looked into it, but off the shelf what would it cost to buy a whole gallong of veg. oil. Is it cost effective.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member