MPG towing question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 10-26-2013, 06:01 AM Thread Starter
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MPG towing question

35ft TT about 8k loaded. I'm getting between 9 and 11 towing. Tow/haul mode, no cruise and keep it between 60 and 65. Talk to other 6.7 owners and they say I should be doing better. What do you guy think? Also towing in Florida. So pretty flat roadways.
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post #2 of 13 Old 10-26-2013, 06:06 AM
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That sounds about right. 8000 lbs is pretty light weight now-a-days but you're wind drag is probably what's pulling your numbers down.
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post #3 of 13 Old 10-26-2013, 06:39 AM
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Originally Posted by Ajc722 View Post
35ft TT about 8k loaded. I'm getting between 9 and 11 towing. Tow/haul mode, no cruise and keep it between 60 and 65. Talk to other 6.7 owners and they say I should be doing better. What do you guy think? Also towing in Florida. So pretty flat roadways.
That's right about what I'm getting towing a 9500# 5r.
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post #4 of 13 Old 10-26-2013, 07:08 AM
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2wd w/3.31 towing 13,000 5th wheel through MI and IL this summer got 13.4mpg


2012 F350 2wd srw 8' Lariat 6.7
2004 Ranger FX4 Level II
2008 Mustang Bullitt dhg
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post #5 of 13 Old 10-26-2013, 08:47 AM
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2wd w/3.31 towing 13,000 5th wheel through MI and IL this summer got 13.4mpg
graygearhead brings up an important specification about his truck and why he's getting 13.4 mpg towing. He has the 3.31 rear end. OP, what rear end do you have? I ask BC mine has the 3.31 and I get 23 mpg not towing running straight highway but a guy I met at the diesel pump said he only gets 18.5 mpg but his rear end is set for more torque.

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post #6 of 13 Old 10-26-2013, 06:50 PM Thread Starter
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I'm running 3.55's with 245/70/17's . I know. Small tires. It's what the truck came with. I've been talking to some guys at the campground today with similar set ups and trucks and they are getting the same mpg as me. I guess it is the wind drag.

12 250 cc 4x4 3:55, 325/60/18 XD Cranks. Stock suspension.
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post #7 of 13 Old 10-26-2013, 08:53 PM
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Wind drag is a big deal. If you could get your highway speeds down to 55 you would find your MPG will probably go up 20-25% over 60-65. But what fun would that be?

My trip computer is usually pretty close to accurate when compared to hand calculation, and it says I've been getting 18.8 MPG for the first 2600 miles in my '12 CCSB 4x4 F250 with 3.55 gears, running empty. We're getting a TT next year.

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post #8 of 13 Old 10-27-2013, 07:24 AM
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Aero profile will be a larger factor than weight or gearing

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post #9 of 13 Old 10-27-2013, 08:16 AM
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Just to add to my mileage report above, we just did a 1875 mile round trip to FL and got 21.2 with interstate and many stop lights in AL. Tried to stay at 70 on the interstates. Also, the truck has a hard bed cover when we do vacations w/o the 5er which seems to help w/mileage. No 4x4 and the 3.31 are also good for mileage, too. In addition to that I'm using Motorcraft full syn 5w-40 and Motorcraft cetane boost at every fill-up. It all helps!


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2004 Ranger FX4 Level II
2008 Mustang Bullitt dhg
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post #10 of 13 Old 10-27-2013, 09:02 AM Thread Starter
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I agree with the cetane booster. It adds 2 mpg when not towing. Didn't add it this trip for some reason . Thanks to all for your advice.

12 250 cc 4x4 3:55, 325/60/18 XD Cranks. Stock suspension.
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