I bought a 2dr Geo Tracker for a DD
It gets about 30 MPG around town and to and from work.
Cost me about 2,200 10 months ago and probably saved me half of that in gas so far by not driving my jeep with 14-16mpg.
'99 WJ I6 w/ 180k (and Purrs like a kitten)
Claytons LA | 6.5" | HP D44 | F9" | 35's\
The tallest gears I know of for the D44a (these also exist for D30/D35, although those might go taller) are 3.08. Those, in a V8, with mods to enhance low-end torque, and stock size, or slightly smaller, tires, should give decent city mpg, and pretty good highway mpg.
16-20MPG, is a good number for a WJ. I drive about 3,000 miles or so every 6 weeks. So drive alot, things to think on some of the things you list will help in some cases. Also what size wheel/tire combo you are running. It has to do with rolling restances. I avg right at 18-19 mpg with 3" lift and M/T's. Oh yeah i have the 4.0L and 233,xxx or so miles on it. all the main stuff is OE, save the lift and preformance goodies. Before the tire swap i was pulling 20-23 hwy. So it is possible. It all comes done to driving habbits and maintances. Remember its a Jeep, and drive what you want. I know when i came back from Iraq gas was close to $5 for 91 which is what i run in my mustang. I drive what i want and deal with the gas prices. Piss on Hybrids.
I currently commute from western MD to Baltimore daily and i refuse to drive a tiny-death-trap-beater because it gets 40 MPG, just accept your MPGs and enjoy the drive!
Also stay away from CAI and bigger throttle bodies since increased air means the mixture of gas will also increase......
I know I'm bringing this post back from the dead, but I picked up quite a bit of mileage (albeit in a ZJ 4.0) through proper maintenance. Do ALL the fluids and replace with synthetic. I run Mobil1 HM oil now too at the factory-recommended 7500 mile drain intervals. The previous dino oil was getting changed every 3000 and was filthy. Before the switch, I ran some lubromoly engine flush and the Mobil is staying pretty clean but is also doing a good job washing out some of the misc sludge you can see in the valve cover.
I also did a full tune up and went with NGK spark plugs. They seem to work better than the Champions I used at the last tune up. Making sure your vacuum system is intact is important - small vacuum leaks cause the engine think it is running lean and adjust fuel to compensate. Making sure the PCV system is unclogged and operating correctly helps. If there is too much crankcase pressure, you will not only be burning oil, but restricting performance. I also Seafoamed the chambers and cleaned the throttle/ISV with throttle body cleaner (better than carb cleaner because it contains a lubricant). This really helped in the low-throttle driveability so I could use less throttle for average acceleration.
If you have more than 90,000 miles, go with a new front O2 sensor. This is the sensor that the ECU uses to adjust the mixture. They have a lifespan of about 100k.
The only mod I did and also the biggest help in getting more mileage (and also more response off the line/on the trail) was deleting the mechanical fan and installing an electric fan. I'm not sure if your WJ has the hydraulic-powered fan or not, but if it is mechanical, ditch the fan and clutch and go electric. If you are moving more than 20mph you don't need to be spinning that big heavy apparatus. I run a Ford Taurus 2-speed fan with the DC Control 2-speed controller. Even sitting parked or crawling at 1mph the fan only runs about 30% of the time and doesn't even use high speed, even when it was 100ºF. With this I'm getting 17 mixed 22 freeway mpg in the boxy ZJ with 200k miles on it. The motor runs so smooth and quiet without it and I would highly recommend this to anyone with a Jeep. There's no downside!
Yes. Also in some motors, the flame propagates differently with the +4s and that's not necessarily a good thing. The 4.0 was intended to have a single prong electrode and runs just fine with regular copper plugs. The only advantage to +4 plugs (assuming you have no ill effects) would be longevity. The platinum and 4-prong design should be good for around 100,000 miles.