Which engine-transmission-transfer case do you have? There is difference in fuel mileage between the smallest to largest engine. You are reporting 10 MPG. Perhaps you have the honking big V8 in yours. In the past, I owned a '92 Jeep Cherokee and now have a '98 Cherokee, both with the 6 cy in-line, 4 liter engines. In good weather, highway mileage is 20+ mpg, but in this brutal winter, it has dropped to 15-18 mpg. I have found three factors that affect the mileage of my Jeep: 1. Low tire pressure - about 2 mpg. Inflate to 30-32 psi will get this back. 2. Low coolant temperature - about 2 mpg. If the thermostat is not working properly or is rated to open at too low of a temperature, the engine never gets warm enough. For the worst of cold, you may consider a radiator cover, but don't forget to open it as soon as the temperature rises to 20 F or so. 3. Failed temperature sensor, the one that sends engine temperature to the engine controller. There is a little hit for 2-wheel drive versus 4-wheel drive, but not as much as might be imagined because the front drive shafts, differential, and universal joints are engaged all the time anyway. However, this statement holds only for the "full time" mode. If your transfer case has only "part time" drive when in 4-wheel drive, it should be disnegaged for regular driving on surfaced roads. The part time mode is only good for mud, sand, and snow where the wheels are free to slip. Part time mode forces both front and rear drive shafts to turn at the same speed - no center differential action. The drive train may bind and be damaged if operated in the part-time mode on paved roads, and will bind when turing. Small differences in tire circunference between the front and rear tire sets will cause binding in the drive train when in part-time mode on surfaces where the tires can get a grip. The part-time-only transfer case has very limited on-road use - its for off-road and getting out of mud holes.

Would think few ounces of mineral oil should increases your volume of gas. Might squeek when you walk though.

chrisk - You do have choices. My job/career would be totally different if I moved to one of the big cities. I made the choice a long time ago to stay in the smallest city/town I could and still have the same type of job, although not the best, most upwardly mobile, interesting job. In a smaller pond its harder to move up the chain. I could have gone to the big city, moved up the chain, had far more interesting work in my field, and retired to a small town with more retirement (I'm not retired yet but you get what I'm saying) but elected not to do that and traffic/commutes was one of the top 2 reasons. And I've had to move around some. I do not live in my home state like I wish I did. My new location 25 minutes is by far the longest commute I've ever had to contemplate. You can move, live in fly over country, or suck up the commute.

My good old 1983 Toyota Tercel 4WD station wagon got 43 miles to the gallon the day we drove it off the lot! That was freeway miles, and aroun 28 to 30 in town. It's still running strong some where in Idaho... I had it for 19 years, and it was still getting 32 mpg from it's tired old engines. All these new engines are too heavy.... should be able to get that mileage, but with all the stuff they have to put on the engines anymore.... in Europe they have big cars that get over 30... with diesel. Too bad we won't see that here either... one of my accounts is a volkswagon dealer... the bugs ESTIMATED mpg is 20/28. In my 2000 Taurus, my ACTUAL is 23,24/28.5. .