Those are the same numbers that I get with my 2 ton Low Cab Forward with the 283, SM 420, 7.20:1 rear, 10R-22.5 tires. Only difference is the way the numbers are arranged, I think it's closer to 18.5 gallons per mile!
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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