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I have a stock 3.73 rear end. I have tried lowering the mph to 65, 60 and still get similar milage. I have only been checking it on long trips where I will fill the tank a few times and drive for hours before stopping. Usually has been between Texas and Minnesota on I 35 during the summer. I know it won't be good on short trips. I have read where larger exhausts and different intakes make a difference on pickup trucks but I haven't heard from anyones personal experience yet on Excursions. What is a DP tuner and how much are they for the Excursion? Is it better then a Superchip?
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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.
Last edited by 01 Excursion; 08-30-2009 at 09:34 AM.
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