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The 92 F150 has a very tall final drive ratio, 1550 RPMile in 5th gear. On a recent 860 mile trip, I started back on Interstate 20 in SC and accidently left it in 4th gear for 10 miles. It was dark outside and it took that long for me to realize my mistake.
Truck got 20 MPG at 70 MPH which worked out to 1800 RPM in 5th gear (.79 OD with a 2.73 rear, 28 inch diameter tires).
regards
badger
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