I just picked up a 2004 Land Rover Discovery 2. It is in great condition but, these were never known for their gas mileage. It will be pretty much used as a soccer mom special picking up kids and groceries with the occasional road trip and the extremely rare off road experience.
It runs just fine now but, I'm putting together my game plan on the eventual swap to diesel. I originally was thinking the Cummins 6BT but, now am wondering if the 4BT or one of the Merecedes powerplants might be easier and still get me into the 20+MPG range.
I did not see any threads on Disco conversions. At 3900 lb gross weight, I would guess that something that could push a Wrangler or Cherokee would be comparable.
Knowing that there are a lot of thoughts on this with much greater expertise than me, I would like to see what any of you are thinking.