A couple things you can do that will help gas milage are get a new aftermarket air filter or a complete cold air kit, getting a better more free flowing exhaust will help. These wont do alot, but are free and might help: Clean the spark plugs and if needed regap them, clean the spark plug wire contact points, and the distributor points, clean coil point, and if you really want to help your milage in the summer, drive with the windows down instead of the a/c. Saw a thing on mythbusters that you can get way better milage that way. If all else fails try not to accelerate as quickly. Hope some of those helped.