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Ok air to 50 psi since tires on that mostly max 50 psi just read max psi on tires then air to it.
My F250 tires max is 80 psi.
Then on highway just cruise 60-65 but when you go downhill just go 70-80 mph then let itself do work like you keep same position on gas when you drive flat to hill then downhill.
That how I got better gas.
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