gas is getting real expensive, I used to have a Toyota Landcruiser with a 3.5 liter 4 cyl diesel, it got 28mpg always. How about an adapter plate of some sort to mate up a diesel to a Jeep transfer case? Which leads me to another one, a good diesel motor around the 2.5 to 4 liter size. Oh yeah, that Toy was unstoppable off road due to the torque.