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Old 06-20-2015, 10:04 PM   #81
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Yes that is correct 85 at high altitude is pretty much exactly the same 87 at sea level. I live in Wyoming and that's all we have also.


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Old 06-29-2015, 03:11 PM   #82
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I had a 2012 ECO-Boost F150 XLT SuperCrew 4X4. Driving to DC and through the mountains of east TN last year, I was only getting 10 MPG with a 27' TT that weighed about 5400. I had a 9200 payload package, so the gear may have had something to do with it. One of my buddies told me I need to run premium while towing with the ECO-Boost, but I have yet to read that anywhere. I decided to step up to a bigger 5th wheel and now have a F250 Diesel that get about the same in the city as my F150.
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Old 06-29-2015, 09:31 PM   #83
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Premium fuel is "recommended when under extreme conditions such as towing" according to the manual. I have tried all three grades in various conditions. I got about 10 mpg towing my 7,500 pound trailer no matter what. After talking to people, 10 is actually pretty good.
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Old 06-29-2015, 10:51 PM   #84
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I realize this is a 2014 thread, but... My last trip if it helps the conversation. midgrade fuel, camper in sig.
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Old 06-29-2015, 11:13 PM   #85
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I realize this is a 2014 thread, but... My last trip if it helps the conversation. midgrade fuel, camper in sig.
Wow that is pretty bad compared to the other 2015 reports on the F150ecoboost site. Hopefully, your trip was uphill into a headwind both ways. . .
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Old 06-29-2015, 11:17 PM   #86
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Wow that is pretty bad compared to the other 2015 reports on the F150ecoboost site. Hopefully, your trip was uphill into a headwind both ways. . .
Yea I am going to get a couple more grand on the clock and see if it gets better. In town, I am getting almost 19 unloaded. Towing though she seems pretty bad. I will tell you, my trip back (400) miles was no joke. Rain and terrible visibility the entire way. I'll keep monitoring it for sure.
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Old 06-30-2015, 07:32 AM   #87
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Mileage should get better when the truck breaks in. My 2013 Ecoboost was terrible the first 5,000 miles but after that improved a lot.
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Old 06-30-2015, 10:23 AM   #88
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Mileage should get better when the truck breaks in. My 2013 Ecoboost was terrible the first 5,000 miles but after that improved a lot.
The only way my mileage got better was:
1. Changed the plugs (.030") from the original horribly gapped plugs (.032--040). I wonder if the 2015s still have this problem?
2. 1st oil change moved to full synthetic.
3. Learned to drive the twin turbo beast a little more conservatively.
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Old 06-30-2015, 11:10 AM   #89
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The only way my mileage got better was:
1. Changed the plugs (.030") from the original horribly gapped plugs (.032--040). I wonder if the 2015s still have this problem?
2. 1st oil change moved to full synthetic.
3. Learned to drive the twin turbo beast a little more conservatively.

I did #2 and #3 but never heard of doing #1 on a brand new truck?


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Old 06-30-2015, 11:29 AM   #90
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It does seem odd, but my original plugs were all over the place. There are tons of pictures and reports of the gap variance on the Ecoboost. There is also a porcelain cracking issue, but I didn't have that. I am not sure there is a consensus on whether the plugs were installed with improper gaps or if the turbo engine makes them change. There is conversation on both possibilities.



On the bright side, there are only six plugs (@ < $6 each) and they are the easiest plugs to change of an V engine I have ever owned. It might take you a half hour to pull and check the gaps at most.
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