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All my calculations are based on miles driven and gallons put in too completely fill the tank. I would only due the mpg checks when I was on 500 plus mile trips. My computer is now indicating 23-24 mpg but that has been that way ever since I added the Superchip. I knew that wasn't acurate at all and have never relied on that reading. Prior to the chip the readings were within a mile or 2 of actually what I got, 16.5 mpg.
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01 Excursion, 4 x 4 Limited, 265/75/16 Firestone Transforce HT maintain 72 psi front- 70 psi in rear, Superchip, 3.73 rear end, Airbags front and back (10-15 psi) 275,000 miles.
01 F-350 dually, 4 x 4 Lariat, Hypertech chip, AFE air intake, 4 inch MBR Exhaust, rear air bags (25-50 psi) 110,000 miles.
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