Follow these tips to try to maximize mileage.
1) Accelerate slowly... try not to exceed ~2200 rpm's while accelerating.
2) Check you tire pressure. run 35 psi minimum.
3) Run with windows down and AC off if it's adequately comfortable outside. Below 60 mph this is STILL better for mpg than AC on and windows up (although only by a small margin, typically only ~ .5 mpg).... trust me.
4) If you're on relatively flat ground, use the cruise control like you're addicted to it. If you're in hilly terrain don't use it (because it will accelerate hard uphill, and try to coast downhill), but try to keep the accelerator pedal in the same position and just let the vehicle speed vary slightly depending on whether you're headed uphill or downhill.
5) Try to maintain at least 45 mph (where the torque converter locks up) but no more than 60 mph.
6) Avoid stop and go as much as possible... try to time traffic lights so that you either never use the brake, or use it as little as possible. It takes a LOT less energy (gas) if you can avoid coming to a complete stop at lights.
7) Once you're past your break-in period, run Synthetic oil.
Make sure your plugs and wires are good. If you're past the 25K mark, you likely need a new set of plugs and wires. From what I've read, that's about the lifespan of the stock stuff. Buy a better set after that, and they should last 35-50K miles.
Can't vouch for these tips working for everybody, but I AVERAGE about 19 mpg on a typical tank, and have gotten as much as 24 mpg on a (almost all highway mileage) tankful.... which seems to be far better than most people are getting out of their 3.7L 4x4 (automatic trans) Libertys.
Luis
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