Wait a minute, I have 2 AutoStick GTs and they both get 25-26 MPG at 70 MPH with the cruise control on.
Sounds like Stage 1 and your bigger/wider wheel combo (more rolling resistance) *might* be your downfall. Was your car loaded up with gear? Enough air in the tires? Etc...
Before your next trip, remove the battery cable for 15 minutes and then get your car on the highway. No WOT, rice-killing bursts. Try to get the car to learn, dare I say it, "normal" driving habits.
Scott
Oh, one more thing, does Nebraska use reformulated gas from November to April like the Northeast does? Reformulated gas absolutely sucks for gas mileage. Better for the air, but not for mileage.
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