EPA said 25 city and 26 highway for the 1985 Jeep Cherokee 2.1 Diesel Here is the link:
http://www.fueleconomy.gov/feg/bymodel/1985_Jeep_CherokeeWagoneer.shtml
By comparison the 2.5 gas Cherokee was rated at 18 city and 24 highway
Not much of a highway improvement, but a good city improvement. But, remember the 2.1 diesel is hard to find parts for and poorly understood in this country.