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Guys that swap 4BTs into Jeeps generally get around 30MPG highway, even with lifts and tires. I've also read a thread about a guy swapping a VW TDI (I believe it was a 1.9) into a Jeep Liberty with a small lift and aggressive tires. He had some power mods and it sounded like it did pretty well, still got around 30MPG. Your aerodynamics are likely better, but weight is probably higher than most of the little 4x4s. I would say 30MPG would be pretty easy to get with the right swap.
Why not a Duramax? I saw a video of a Mustang that had one that put out 800hp, got over 30MPG highway driving it to the drag strip. :P
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