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I have 243k on my 01 Excursion and I am on my 5th set as well. The last set I bought was the Optima and they were replaced once for free after about 2 years and the second set lasted just over 3 years.
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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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