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Fuel economy will probably be better than your gas Jeep, but given how the current 2.8 does, I doubt it'll be very economical.
Most of the economy issues with the Jeep are down to the heavy dual live axles and the poor aerodynamics.
I once ran a 2.8 CRD Wrangler for a week. Got much worse economy than the bigger, longer and heavier Colorado 2.8 (exactly the same VM Motori diesel) that I loaned a few months prior. (I don't live in the US... our Colorado is different).
I suppose the 8-speed will help city economy somewhat. Won't hold my breath for big numbers on the highway.
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