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Old 03-20-2010, 07:55 AM   #15
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2007 31' Classic
Kansas City , Missouri
Join Date: May 2009
Posts: 299
On our first trip of 1,854 miles from KC to Austin and back, we used 152 gallons for 12.0 MPG. The Duramax engine loafs at 1,700 RPM at 62 MPH while towing our 8,000 trailer. Our truck achieved these numbers in a 35 MPH crosswind for 700 miles, and a driving rain for 250 miles, over some very hilly terrain. Coupled with a totally comfortable cab and a 100,000 mile warranty, this is an excellent tow vehicle for a big camper. I'm sure 2011 trucks will add horsepower, but it's just incredible that 2011 Fords can so dramatically improve to more than 20 MPG without tradeoffs in other aspects of performance and quality, all things considered equal. You'd have to show me.

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Old 03-20-2010, 02:27 PM   #16
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Minneapolis , Minnesota
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Posts: 6
Originally Posted by tkasten View Post
I have an 09 Silverado 4x4 w/tow package and 5.3 v8 w/3.08 gear. I get 18 - 20 no load on highway. Pulled the trailer about 2500 miles last fall at 11-12. My two sons have Ford f-250 Superduty 6.0 for their work. When towing they get 13. Not enough of a difference to cover the huge extra cost. They can pull a much larger trailer. Hope this helps.....Tim
Thank You! It sounds like the 3.08 would be similar to the 3.42 that I have but with better MPG empty. With the speed between 59 and 70, I have gotten 18.6 MPG highway. In 6th gear it runs 1500 RPM at 59 MPH.

I have yet to tow with it but hope I can get as good MPG towing as the 3.08 gets. Time will tell if I made a err in judgement (mistake) getting the 3.42.

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Old 03-20-2010, 03:24 PM   #17
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1965 22' Safari
Vassar , Michigan
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I made a mistake. My truck has a 4 speed tranny and 3.78 rear end....Tim

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Old 03-21-2010, 09:55 AM   #18
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1970 31' Sovereign
danville , California
Join Date: Mar 2010
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I used to get that milage in my 5.7 tundra with 4.30 gears before I added a leveling kit and load range E tires. now Im getting 17 high and a mix of 15. I have yet to tow with it, but and expecting around 12mpg. At 65 the engine sits at 1700 rpm. I am loving the 6 speed and this huge improvements you get over a 4 or 5 speed.
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Old 04-24-2010, 01:36 PM   #19
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Minneapolis , Minnesota
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I finally got a couple of hundred miles of towing with the 3.42 rear ratio Chevy. With a variety of terrain, I have averaged 14 MPG. That is better than I expected. The non towing mileage has been less than I expected. What has been a major plus when towing is the Tow Mode on the 6 speed transmission. It keeps the RPM's up in the higher torque range. Not only does it accelerate nicely but when up to speed on level terrain, it goes into 4 cylinder mode and saves gas. I never expected to see the 4 cylinder mode when towing.

Obviously I don't have enough miles in to predict the MPG I will obtain on a longer trip. Wind can make a huge difference when towing. Some areas have constant blowing. Still, the tow mileage is encouraging.

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