what would be the best donor vehicle?

I wish I had mine on the road to tell you my mpg. I've had it running to test my wiring, but right now I'm working on paint and body work and am far from getting it back on the road. Given that I can get 20 on the highway with my 04 Durango, I'm expecting at least 25 and possibly more.

I had to widen the tunnel about 5 inches and lengthen it some as well as make a custom mount setup. There is good info in this thread: http://www.forabodiesonly.com/mopar/showthread.php?t=120972