Phil,
I would not expect the top end of that estimate either. I own a 1990 40' Wide body with tag axle. Gross weight is 39,000 loaded. We do not pull anything normally. We run 100+psi in all tires and 110+ in the steering tires. I have averaged about the same as Bob - 6mpg. I average about 65 - 70 mph. At 60 mph the mileage will be close to 7mpg and at 75mph the mileage will be about 5mpg. Have fun on your trip!!
David
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1990 Newell 40' Wide Body
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