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Old 07-11-2012, 08:22 PM   #11
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I have the 3.55 gears. I got 11.1 from hocking hills, OH to Detroit. Not bad for 68-70 mph. The bigger tank would be awesome but I wont do it it's a lease.
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Old 07-12-2012, 08:01 PM   #12
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Some thoughts:

1) 68 to 70 mph; your tires are speed rated at 65 mph if they are ST's
2) 26 to 36 gallon tank; they kill you on parts; looked at this move on my last F150 and the parts alone were over $1,000. Find a wreck?
3) I'm getting 11.0 to 11.5 pulling a 5,500 lb Survery with my Eco w 3.73s
4) Driving style, speed and conditions will play a far bigger role in gas mileage than gearing. You might get a few tenths with 3.31's or 3.15's but then what can you tow with that?
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Old 07-12-2012, 08:05 PM   #13
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I will check the tires to see what they are rated at. But the mpg that have gotten has been acceptable to me. I did my best to keep the truck in 6th. That I think is the trick keeping the truck in the highest gear.
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Old 07-12-2012, 09:48 PM   #14
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I will check the tires to see what they are rated at. But the mpg that have gotten has been acceptable to me. I did my best to keep the truck in 6th. That I think is the trick keeping the truck in the highest gear.
Heck yes! You are getting good mileage when towing! 6th gear gets you the best mileage. That and keeping your speed down. There is a big difference between 65 mph and 60 mph mileage when towing. But it is all a trade-off and what is important to you. Have fun!
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Old 07-12-2012, 11:04 PM   #15
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I tow a surveyor 189 with a 2wd ecoboost with 3.15 gears and average 9 mph at 70 mph on flat land.
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Old 07-12-2012, 11:40 PM   #16
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I hit 60 and am watching the mirrors for chunks of those crappy Trail Expresses. You guys need to strap a big set of steel balls to the back of your truck! I know mine aren't that tough to push these TT tires that far, lol. Maybe when I get the Kumho's on...
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Old 07-13-2012, 01:07 PM   #17
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I hit 60 and am watching the mirrors for chunks of those crappy Trail Expresses. You guys need to strap a big set of steel balls to the back of your truck! I know mine aren't that tough to push these TT tires that far, lol. Maybe when I get the Kumho's on...
You will LOVE the Kumho's; they are awesome tires. I mounted some this year and installed a Truck Systems Technologies tire pressure monitoring system. Now I don't worry about missing a tire going low. And the Kumho's are rated for 99 mph (not that you'll use that) and well as D load rating.
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Old 07-13-2012, 01:09 PM   #18
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I tow a surveyor 189 with a 2wd ecoboost with 3.15 gears and average 9 mph at 70 mph on flat land.
So, from your posting, it looks like the 3,15's don't get you any better towing mileage; but probably better empty mileage. What do you get empty? I get 21 mpg @ 65 mph with my 3.73's and 4WD.
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Old 07-13-2012, 01:39 PM   #19
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@teamgl - check out the F150 threads.
26 Gallon to 36 Gallon fuel tank mod on Ecoboost - Page 2 - Ford F150 Forum - Community of Ford Truck Fans
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Old 07-13-2012, 10:55 PM   #20
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So, from your posting, it looks like the 3,15's don't get you any better towing mileage; but probably better empty mileage. What do you get empty? I get 21 mpg @ 65 mph with my 3.73's and 4WD.
About the same actually. Maybe 22 on flat land. Not much difference.
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