That ecoDiesel also didn't singlehandedly poison the well for diesels in passenger cars in the US, either...Eco diesel in a newer jeep only 24 MPG.
That MPG is Oldsmobile 350 diesel MPG actually a little less.
That eco diesel makes 2x more HP and 2X more TQ than the Oldsmobile though.
I would bet a revamp of some of that power could possibly get you a 40+MPG diesel Jeep