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Old 07-15-2015, 08:16 AM   #141
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I have found no difference locking out 6th gear other than more engine noise. I just let the tranny do it's thing.
Me too . . .
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Old 07-15-2015, 08:33 AM   #142
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Very interesting reading. Love the way you guys kept it civil and informative. These discussions help shoppers make buying decisions. Thanks.
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Old 07-15-2015, 11:42 AM   #143
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Me too . . .
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Old 07-19-2015, 07:09 AM   #144
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I have found no difference locking out 6th gear other than more engine noise. I just let the tranny do it's thing.
So after reading this comment , I got to wondering if I could be wrong about locking out 6th gear.

Yesterday was the first time I towed with my new 2015 F150. I towed from Ft. Lauderdale to Leesburg,Fl, just past Orlando. It's a really boring drive so I got to play around with the gears and now this truck has a boost gauge. It was really windy and rainy so milage was only about 10 going 62-63 mph pulling 7,800 lbs.

What I found interesting was that in 5th gear, running right at 2,000 rpm the boost gauge ran 1/2 as much boost as it did in 6th gear at 16-1700 rpm. So even though the rpm was higher, the turbo boost was lower. Also, in the central Florida hills (yes, we do have some) the the transmission would downshift while in 6th but never downshifted while in 5th.

On Wednesday we start heading west so I will get a better handle on mpg. Overall, the truck just seems "happier" in 5th gear while towing.
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Old 07-19-2015, 08:09 AM   #145
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What I found interesting was that in 5th gear, running right at 2,000 rpm the boost gauge ran 1/2 as much boost as it did in 6th gear at 16-1700 rpm. So even though the rpm was higher, the turbo boost was lower. Also, in the central Florida hills (yes, we do have some) the the transmission would downshift while in 6th but never downshifted while in 5th.
Yep, that's right. Think about it; 5th acts the way it does because:
1) It's a more advantageous gear ratio; making it easier to pull the load. That's why it rarely shifts out of 5th. It takes one heck of a hill to require 4th.
2) Your engine RPM is higher for an equivalent road speed; putting you more into the torque band.

Both of those reasons are why you see less boost and experience less shifting when towing in 5th.

While the Eco has excellent torque characteristics for a gasser, RPM is still only in the 1,500 to 1,650 range at 60 mph (depending on your axle ratio). That's barely above idle speed. To me, it's amazing that the truck will tow at all in 6th given that engine speed.

I've got 3.73's, so my 62 mph towing speed is about 1,700 RPM. At that speed, my truck rarely shifts out of 6th. I do getting shifting when towing at 55 mph on 2 lane highways as the RPM is just too low. So, I do lock out 6th in that circumstance. Often those roads are a little hillier too.

The lower your axle ratio (numerically), the lower your RPM is going to be for a given road speed. F150 axle ratios vary from 3.15 to 4.10. That may cause different experiences among us for what gear you can hold and how often the truck shifts. And, of course, we are hauling different loads varying in wind resistance and weight. Add in topography and wind, well you get the picture . . .
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Old 07-19-2015, 09:08 AM   #146
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2014 Ford F-150 Crew EcoBoost Fuel Economy

Fresh Tank of Gas and 120 Miles keeping it at 60-65 I was able to achieve this driving yesterday hit 22mpg for a bit.

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Old 07-19-2015, 01:50 PM   #147
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Originally Posted by Mark S View Post
So after reading this comment , I got to wondering if I could be wrong about locking out 6th gear.

Yesterday was the first time I towed with my new 2015 F150. I towed from Ft. Lauderdale to Leesburg,Fl, just past Orlando. It's a really boring drive so I got to play around with the gears and now this truck has a boost gauge. It was really windy and rainy so milage was only about 10 going 62-63 mph pulling 7,800 lbs.

What I found interesting was that in 5th gear, running right at 2,000 rpm the boost gauge ran 1/2 as much boost as it did in 6th gear at 16-1700 rpm. So even though the rpm was higher, the turbo boost was lower. Also, in the central Florida hills (yes, we do have some) the the transmission would downshift while in 6th but never downshifted while in 5th.

On Wednesday we start heading west so I will get a better handle on mpg. Overall, the truck just seems "happier" in 5th gear while towing.
The Eco has 90% of it's maximum torque from 1700 rpm to 5000 rpm. Very seldom does my tachometer go below 1700 rpm's when I'm towing so I'm already in the meat of the torque all the time. I see no need to stay in 5th gear. I've tried it and it didn't do anything different than towing in 6th gear. This is why the recommended towing engine by Ford is the Ecoboost because it doesn't have to find it's maximum torque to go uphill like a V8 would. Ford even states that you can tow with regular fuel which you cannot do with the gas engines from GM and Chrysler. My last F150 was with the 5.4 motor and that was always upshifting and downshifting looking for the highest amount of torque to move the load. I'm towing a trailer that when loaded is around the 7800 lb mark just like you. I towed this trailer with the last truck and this truck and this one blows the old 5.4 motor in the weeds. The only difference between the two trucks the 5.4 was a 2 wheel drive super crew with 3:55 gears and this one is a 4X4 with the max tow and 3:73 gears.
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Old 07-19-2015, 03:45 PM   #148
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"Ford even states that you can tow with regular fuel which you cannot do with the gas engines from GM and Chrysler."

From the manual, page 167: To provide improved performance, we recommend premium fuel for severe duty usage, such as trailer tow.

Although I have found no difference when using premium fuel when towing.
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Old 07-19-2015, 04:15 PM   #149
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"Ford even states that you can tow with regular fuel which you cannot do with the gas engines from GM and Chrysler."

From the manual, page 167: To provide improved performance, we recommend premium fuel for severe duty usage, such as trailer tow.

Although I have found no difference when using premium fuel when towing.

I've seen that in the book but Ford's own information site states regular. The hemi ram you are supposed to use mid-range when NOT towing and premium when you are towing. The 6.2 motor of GM's is premium all the time, the 5.3 is regular but forget towing my trailer with one, they don't have enough guts.

Even so, at least with the Eco you can use regular all the time. I've tried regular and premium going the same route and the same speed with my trailer and I haven't seen an ounce of difference while towing. A lot depends on winds and temp also.
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Old 08-06-2015, 10:18 PM   #150
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2014 Ford F-150 Crew EcoBoost Fuel Economy

Just made a run from Texas to Ohio. Used a tank of 93 and then a tank of 91. Made an 8 hour run to AR and back last week on 87. Very similar driving, but more at 55mph with the 87 and mostly 65-75 on this run when not in towns/cities. Got 17.4 on the 87 and 19.2 on the premium 93. Kept the clock running on the 91 fill up and went down to 18.8 indicating about a 1 mpg loss. Filled with 93 again and went back up to 19 within a few hours. Therefore, I find a significant difference in mileage as octane goes up. Seems to run better on the 93, so it's premium from here on out for me. I'm very pleased with this mileage considering I'm running on heavy LRD 20's with aggressive tread.
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