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I run 25% over on my truck, but these are Firestones.
It gets better than the MPG I got with the tires pressured up to the sidewall number (80 psi) but I suspect anything over 90 psi is a waste. At 100 psi, I don't notice any "crowning" of the tires - the tread is dead-flat across.
I'm talking "E" rated (ten-ply) tires.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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