Is the 12V Cummins what they call the 6BT engine? I think that one was in the Dodge Dakota for a while. I think you can convert the 1999-2004 VW TDI engines to use a mechanical fuel pump, but I am not sure you could ditch the computer completely. Really though, if you care about being eco-friendly, then the best diesel to get would be a late-generation with DEF and all the computer tuned variation gizmos. Propane would definitely be better, but I wonder if you could get the range you might want for long trips... and could you even get propane reliably on the highway?
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