.....speed will determine your fuel mileage......my turned up 500hp N-14 will do about the same with 3.58's at 22,000# tractor and 12,000# trailer.....if you want to increase that is cheap go to 24" tires and rims.....otherwise It isn't really worth the $$......unless you are high mileage over the years......and at $4.199 a gallon this weekend it will take forever to pay for itself......mine is set for 105 mph and will do it with ease.....8.5 to 10 is the range with a lite foot at 58 to 60 above that It will drop off .....geofkaye
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