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How fast do you tend to drive on the highway? I expect optimal mileage is going to be at 55-60mph.. if you're regularly doing 75, you're gonna take a mileage hit.
First and foremost, check tire pressure. I go with the max shown on the tire itself. Tire type and size... it's all about rolling resistance... different tread patterns and rubber compounds all affect this. Just think how hard it is to push your car on level ground. Then let 5psi out of each tire, and see how much more difficult it is.
jack up wheels and manually turn them.. make sure no brakes are dragging. Of course, basic tune up stuff is certainly always good, but if the car is running well... the tune up costs will probably take as long as the tune up to last before you break even on fuel cost.... at best.
Tranny fluid change is never a bad idea, but you won't notice a diference. And it is a bit of a pain to do yourself (the location of the filler plug). An oil change would probably do you more good.. especially if you are running anything thicker than 5w30 (though your in the SW.. probably best to run 10-40 with summer approaching)
Remove excess weight from the car.
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-Matt I ♥ my ♂
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