You don't want a chip to get better mileage. Even with a stand alone fuel management system that costs 100 times this bogus chip, it's quite difficult. Want to save gas? Drive slowly. Don't take off like you're Fast and Furious when the light turns green. Don't go over 68 on the highway. Use cruise control if you've got it. Park in the shade. Make sure your tires are inflated. Replace old air filters. Use decent oil. Remove extra weight from your car that you don't need. I don't even have back seats.
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