I Have a V-8!! Moderator
It would make sense with the truckers. Farmers and ranchers use quite a bit too although a lot of the ranchers here are working with ATVs & side by sides, which are gas, now. I think a lot of it would depend on what type of shtf scenario happened too. Power and electronics knocked out and no repair times in site..........no pumps to get fuel, etc. Bio diesel could be made in some circumstances too. The fuel availability may be better, but then would there be anywhere to go or need/want to go anywhere if the shtf? Mileage doesn't seem to be all that better either over the gas engine according to the guy selling his D4D conversion. Add the big expense of the conversion in and it's kind of not worth it really.