Drillbit said:
I can not imagine how slow that will be
The engine specifications suggest about as slow as the land rover diesel engines.
Mercedes Benz OM617.952, 5-cylinder turbo from W123 300D:
125 hp and 180 ft-lb
200 Tdi and 300 Tdi:
111 bhp and 195 ft-lb
I swapped an OM617 into a dangerously underpowered W123 240D, which originally had the OM616, a 4-cylinder naturally-aspirated diesel. While this car is not going to win drag races or autocross events, the OM617 pulls strongly through the entire range. It cruises all day at 65-75 mph with pedal left over. Currently there are over 275,000 miles on the clock. Even being heavy on the skinny pedal it averages 25-28 mpg. Obviously the Discovery weighs more, approximately 4500 lbs versus 3500 lbs, and is geared lower, 3.54 versus 3.07, both of which negatively affect fuel efficiency.