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post #7 of (permalink) Old 08-10-2010, 02:11 PM
Spartan Diesel Tech
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Originally Posted by Truckmaniac View Post
I flew to Houston, Texas to buy my 2010 F250 CrewCab 4x4 with 3.55 gears, then drove it 70-75 mph back home, which was 600 miles. Bone stock I averaged 16.9 mpg (took time to fill the tank to the brim & hand calculated the mileage) and saw the "Cleaning Diesel Filter" display come on 3 times.

Immediately added the 250 Tune and deleted the DPF. Made the drive to Houston and back 2 months later, same speed, same route and basically the same weather pattern.
I got anywhere from 17.1 to 17.4.

Fast-forward another 10,000 miles with the 250 tune and my highway average at 70-75 mph is still around 17.0 to 17.5 mpg. I have seen one tank that did 18 +, but I had a pretty good tail wind.

How much horsepower would it take to get 19 to 20 mpg on my truck: 400, 500, 600 or higher?
I have 3.73 gears in my truck and I have gotten 17.5-18.0 on a long trip with the 210 tune. Back when I was leveled out and on 35" tires, I ran 70 mph from Knoxville, TN to Atlanta, GA one night and hand calculated over 19 mpg with the 275 tune.

Jeff Dodd - www.SpartanDieselTech.com
Email - [email protected]

2008 Ford F-250 CC/SB
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