My girlfriend drove mine to Atlanta the other day and according to her got 22 MPG on the interstate. I have never changed the plugs in this thing and it has 160K miles on it. I was shocked as I just put some 12.50 Mickey Thompsons on it. The big tires may have thrown off the computer or something.....
I have gotten as high as 22+ mpg on my truck as I drive the flatlands between Houston and Brownsville, TX. That's averaging 65 mph, highway. It's a '04 model with only about 61k on it, so it's been broken in very slowly.
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