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Senior Member
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3,051 Posts
I'm running custom tuning from KEM. Current tune we have been running for along time now is a hybrid tow/performance tune. With my Powermax turbo and 35" tires, We average 16 around town, and can get as high as 20-21 on the highway unloaded. Towing everything changes, and depends on the load and how many mountains we traverse. With say 4-horses and gear loaded and lots of steep climbs, mileage can drop to 12-14mpg average. Our truck at 75mph is only turning 2k rpms.

Harry
 

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Junior Member
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79 Posts
Hypermax Econ

I installed a hypermax Econ tuner several years ago and it improved my mileage by 2-3 mpg both towing and solo. Two years ago I towed my 14,000 lb fifth wheel from Florida to Yellowstone and averaged 12.5 mpg. One 400 mile stretch I averaged 14 mpg. I went back to the stock tune when a Ford dealer said that my tuner was causing coolant to blow out the degas, but that didn't help the problem so I reinstalled the ECON.

Without the trailer I get 19 mpg in town and average about 22 mpg on the highway. I drive like an old lady, though. I usually don't go over 65 and use the cruise control.

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2006 F-250 Superduty with 6.0 diesel
 

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Old Fart
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889 Posts
Your head gaskets maybe shot if you are blowing coolant out the degas bottle. You can get a test, at a local auto parts store, To test for the presence of CO2. If it is present your head gaskets are shot.
 

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Senior Member
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1,324 Posts
I installed a hypermax Econ tuner several years ago and it improved my mileage by 2-3 mpg both towing and solo. Two years ago I towed my 14,000 lb fifth wheel from Florida to Yellowstone and averaged 12.5 mpg. One 400 mile stretch I averaged 14 mpg. I went back to the stock tune when a Ford dealer said that my tuner was causing coolant to blow out the degas, but that didn't help the problem so I reinstalled the ECON.

Without the trailer I get 19 mpg in town and average about 22 mpg on the highway. I drive like an old lady, though. I usually don't go over 65 and use the cruise control.

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2006 F-250 Superduty with 6.0 diesel

That's nice mileage. My TT is a square box and pulls hard. We did Yellowstone and I only got about 9-10. I'm 4x4 CC too. My old lady foot is quite heavy also.
 

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Junior Member
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79 Posts
Your head gaskets maybe shot if you are blowing coolant out the degas bottle. You can get a test, at a local auto parts store, To test for the presence of CO2. If it is present your head gaskets are shot.
Unfortunately, that's the conclusion the repair shop came to on Wednesday. I decided to got the whole top end upgrade and they're going to do it for $6800. It includes a valve job, new ARP studs, upgraded OEM oil cooler, EGR cooler bypass, a different programmer to eliminate the check engine light after the cooler is removed, new fuel rail O-rings, coolant flush, coolant filter, etc. He had a full legal-page of upgrades. He's also going to check the injectors.

The truck has 106,000 miles on it and it was fantastic when it was running right. I could do 65 mph up and down the mountains pulling my RV.
 
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