[JET]

With that many miles you are probably getting a lot of blowby, which hurts mileage. Slowing down is the only thing that is going to make a substantial difference. It isn't worth really spending any money on mods, you won't get the money back in gas saved. T

here are a few free things, inflate the tires higher than the car calls for, but not above what the tire says on it. Let off the gas early when you are going to stop and coast for a ways. Any time you are on the brakes, you are wasting gas. Obviously you still have to use the brakes, but try to limit their use. Driving slower is probably the biggest thing. You could always just buy a different car too. I had a $250 92 Sentra that got 38 mpg, it paid for itself in a few months.