I agree wholeheartedly with this; diesel engines are awesomely capable given their method of generation. Not to mention I've seen them run on everything from veggie oil to hard alcohol. Granted, sometimes it's not pretty but if you want a multi-fuel source engine, diesel is hard to beat.

I do like the IDEA of the natural gas system though. That is terribly expensive.. I'm sure if it gets popular maybe in a few years it will be worthwhile.