The usual stuff: Make sure you tire pressure are up to Chrysler's recommendation (found on the door jamb or in the owner's manual--not on the tire itself. You could go a couple of pouinds higher than the recommendation, but don't go crazy. Make sure your tire gauge is accurate. (Digital ones are cheap nowadays.)
Use the proper octane fuel and don't buy it from an off-brand discount gas station. Accelerate gently and stay far enough behind the car ahead and look as far ahead as possible to better anticipate what traffic is going to do so you can avoid see-sawing between the gas and brake. Try to conserve as much momentum as possible.
You can manually shut off you engine at long signals, like hybrids do automatically. You have to be careful not to overdo this and anticipate the light so you don't impede traffic. Note: Hybrid starters are design to constantly do this, but your's wasn't. It could wear out sooner.
Keep the speed down to the posted limit.
If you can't remember when it was last done, replace your air filter. Plugs and wires might not be a bad idea if you mileage is high.
If you have a roof rack on your car that you never use, take it off--at least the cross-rails. Aerodynamic drag saps fuel economy, but this is more of a highway-speed benefit.
At city speeds, rolling the windows down instead of using the AC might pay off, as aerodynamic effects are more pronounced on the freeway. At high speeds, AC on is generally better than windows down. Every car is a bit different aerdyamically speaking, so you'll have to try this yourself.
The following is a highway test, but the interesting part is the magnitude of the change related to driving style.
http://www.edmunds.com/advice/fueleconomy/articles/125158/article.html
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