4.0L OHV engine.
22-23mpg highway with 1997 automatic (5psd) 2wd extended cab. 3.55 gears and 26" tires. 196,000 miles on one engine and 198,000 on another in an identicle truck.
18-20mpg highway with 1997 automatic (5spd) 4x4 regular cab long bed. 3.73 gears and 33" tires. 94,000 miles on that engine.
17-19mpg highway with 1997 automatic (5spd) 4x4 extended cab. 4.56 gears and 33" tires. 193,000 miles on that engine.
I dont ever drive city or stop and go traffic so I cant contribute there. My area is hilly and without traffic lights for the most part.