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What kind transmission it have and what gear ratio in rear axle.
My 87 F250 get 18 mpg on highway that with manual tran only 1.00 plus 3.55 in axle it see 2500 rpm at 65 mph.
Biggest is alignment and air tires to max psi. I believe it 60 psi for rear dually.
Get very slow kick off from stop or you waste diesel.
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