99 4.0 -- getting 19.1 mpg
I bought this Jeep GC 2 WD 4.0 not running, built the engine stock, now got about 15,000 miles on engine, jeep has about 200K total. last 2,000 miles w/half interstate at 70 mph cruise/control, rest 5 - 10 miles suburban driving.. I don't think that's bad!! I've learned to coast a lot more, - I don't mean holding up traffic, just drive half block ahead, take foot off when you don't need power. Another thing, I'm using 5-30 oil, I believe that makes a difference. Full hot engine still has just under 50psi at idle. Runs like a dream!! ((My forum registry says XJ, but I thought it was a WJ??