Quote:
Originally Posted by davideboe
As you only tow 4000 miles per year, I presume that you believe you will save money for fuel as you drive the V-10 without the 5th wheel. Do you know the mileage expected when you are not towing? I have a 2003 Chevrolet 2500HD with the 8.1 ltr with a 4.10 differential. Towing my 12,000 lb 5th wheel, I got 7.5 mpg. Driving without the 5th wheel, I got 11 mpg. I attributed that to the 4.10 differential.
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All 4 of the V10 powered trucks I have owned had 4.30 axle gears in them. all of them would when not towing and just cruising at 65-70mph produced 13-15mpg on cruise control. Manual transmission trucks achieved about 1/2mpg better then the auto versions. GM products with the 8.1L engines burn more fuel due to the larger displacement then the Ford 6.8L V10's and 8.1L GM engines are old technology cam in block design while the V10 is new technology overhead cam design and more efficient.