Diesel Dodge Dart Concept

Hersbird said
Why mid grade gas?

That's along term observation, not a one-time price comparison.

Biodiesel is just muddying the waters. It has gotten much more difficult to obtain low cost trust me I was going to make it from low cost soybean oil in nearby Washington state. What you are really saving there is the taxes which might work for awhile.

All that I know is that he's part of a co-op that makes it from some agri sourced waste product. No idea who/what.

You say you don't know how much that guys conversion cost but just take a guess. Even at a silly low $2000 estimate that buys a lot of mileage. Most likely the rest of the truck will fall apart before it pays.

I really don't know, I doubt that he does either. Any guess on my part would be pointless and misleading.
I'm guessing that you don't have much experience with pre "Taco" Toyota pick-ups. Brand new the truck is more than up to out-living the engine, not the other way around. Given that it was used when he bought it and the engine was a recent purchase telephone pole victim I'd call it a draw.