Towing fuel mileage - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 07-07-2014, 09:31 AM Thread Starter
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Towing fuel mileage

I drive a 2011 F-250 4x4 crew cab and I have an H&S MM with stock tunes, EGR delete, DPF delete, and turbo back 4" exhaust, 3" lift with 35" toyo MT's. I have seen significant fuel mileage increases since deleting with normal hwy driving averaging 18.5 mpg but while towing a 37'-8" tow hauler that weighs approximately 12.5k I am only getting 8 to 9 mpg which is exactly the same as before I added any mods. Should I consider getting custom tunes or just be satisfied with the increased fuel milage while not towing? I am also experiencing slightly harder shifting until the it warms up during normal driving conditions and significantly harder shifting while towing. Any experiences or advice will be appreciated.
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post #2 of 3 Old 07-07-2014, 12:31 PM
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Originally Posted by Fuco12 View Post
I drive a 2011 F-250 4x4 crew cab and I have an H&S MM with stock tunes, EGR delete, DPF delete, and turbo back 4" exhaust, 3" lift with 35" toyo MT's. I have seen significant fuel mileage increases since deleting with normal hwy driving averaging 18.5 mpg but while towing a 37'-8" tow hauler that weighs approximately 12.5k I am only getting 8 to 9 mpg which is exactly the same as before I added any mods. Should I consider getting custom tunes or just be satisfied with the increased fuel milage while not towing? I am also experiencing slightly harder shifting until the it warms up during normal driving conditions and significantly harder shifting while towing. Any experiences or advice will be appreciated.
My experience towing a 22 foot bay boat or a mid-profile 8,000# fifth wheel has been 10 to 11 mpg, whether I'm stock or tuned/deleted (H&S MM with stock tunes). That's with a 2013 F350 CrewCab 4x4 with stock 20" wheels & tires.

Most toy haulers are high-profile and they catch lots of wind, plus your weight is 50% more than my camper. The lift and larger tires also means your truck is less "aerodynamic". I'd say that your mileage is about right.

What H&S tune are you using to tow that beast?

Are you using the "stock transmission tuning" option on the Mini-Maxx?

Are you using the "Tow/Haul" mode on your transmission?
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post #3 of 3 Old 07-07-2014, 01:12 PM Thread Starter
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I am using the stock H&S tunes on both the engine and tranny. I'm upswing the tow/haul option on the tuner and truck.
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