DsimonL - what do you have against running blends? I know theoretically it would be nice to drive on 100% domestically produced renewable fuel, but any percentage you can use helps! Benefits as far as smooth engine etc etc are all available at b20...after that you reach a point of diminishing returns as they say..

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)