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This truck according to my calculations goes 46 MPH at 1200 RPM. 28 inch diameter tires, .79 OD 5th gear and a 2.73 differential. That's some serious tall gearing. Heck you can let off the gas pedal and it will go 25 MPH idling in 5th gear practically forever, which works out to 650 RPM. Even with the not so good BSFC engine it should be able to do pretty good for mileage. The manual says not to go below 42 MPH in 5th, but the EGR mod allows it to cruise at lower than 35 in 5th. Go to low and you can hear the gears in the tranny rattling.
I'm going to fill the 16 gallon front tank tomorrow and see how it does now that it is finally running right.
regards
Mech
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