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Old 10-11-2021, 03:18 PM   #1
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Angry Does this seem reasonable?

I am towing a 6,000 lb double axle Jayco travel trailer with a 2017 Ford F-150 Supercrew, equipped with a tow pkg (up to 10,700 lbs), and a 3.5L V-6 turbo. The tires on the travel trailer were recently replaced, and slightly over-inflated, and my truck tires are slightly over-inflated. I have a weight-distribution hitch and the trailer tows well. The load in the truck bed was minimal. While the terrain/highways in WI aren't flat, I wouldn't consider them all that hilly compared to what you might see out West. i (mostly) use cruise control on the freeway set at 70, and with the transmission set in Tow/Haul mode. Doing so, I am getting about 7.2 miles per gallon over a 240 mile trip. While I expected a significant drop-off from the 22 hwy mpg I get when not towing, I figured I would get somewhere north of 10 mpg, but not so. Am I doing something wrong, or is this about what I should expect? If I get a lighter trailer, say around 5,000 lbs., is that likely to help much, or only inconsequentially? Would an F-150 with a V-8 show less of a mileage drop-off based on what I'm towing?

Thanks in advance for the feedback.
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Old 10-11-2021, 03:49 PM   #2
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The 70 mph isn't helping .
Try a trip at 60 .

Standard trailer tire are only rated for 65 .

Why do you have the tires overinflated ??
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Old 10-11-2021, 04:35 PM   #3
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Short answer, yes the mileage seems right for a turbocharged vehicle towing a parachute at 70mph. Now for a bit more in depth, as was said before slowing down 10mph will help a lot more than 2000lbs less will because most of your issue would be wind resistance once you are up to speed. The 5.0 would get better mileage towing but you would trade it off when empty so it wouldn't be worth the up/downgrade. All in all if you are happy with the trailer and you are happy with the way the truck tows it I would just keep the set up you have, just slow down a tick and enjoy the scenery you will be less stressed and save money at the pump too.
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Old 10-11-2021, 04:41 PM   #4
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I get 6.5 to 7.5 ish towing a 19 to 20k lbs. fiver with my diesel DRW down the freeway at 70 mph. I get 10.5 to 12 ish mpg towing my 15k lbs. mini excavator down the freeway at 70 mph. The big difference, IMO, is not the weight but the wind resistance. Wind resistance really kills you towing faster than 60 mph.
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Old 10-11-2021, 04:56 PM   #5
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During my brief stint towing our 8300 lb. loaded TT with a '19 3.5 Ecoboost I averaged about 10 mpg...and that was primarily towing in Arizona. As others have said, the mph will make a difference. I stuck with 60-65 mph with that setup.

You mention some hilly terrain and using cruise....depending on the grade, I'm not a fan of using cruise as the tranny will downshift more to try and maintain the set speed, which will cost you some as well.

Finally curious about your tires being over inflated, are you saying that you are inflating them over max PSI? Why?
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Old 10-11-2021, 07:16 PM   #6
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Drag is composed of the your coefficient of drag, cross section area, density of the air and your velocity (squared). D=Cd x area x density x1/2 x V x V

55mph to 60mph your drag increases 19%

60 mph to 65 mph your drag increases 17%

65 mph to 70 mph your drag increases 16%

55 mph to 70 mph, drag goes up 62%

The drag is for both the trailer and the tow vehicle go up that same percentage so you get a double whammy.
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Old 10-11-2021, 08:15 PM   #7
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I think I may be able to answer your question kinda.

I had a 2011 F-150 5.0 litre V8 with the 6 speed transmission tow package with the 36 gallon fuel tank. I towed a 26.5' 5,500 lb. travel trailer. I set the cruise at 72 mph. I can not stand being a slowpoke and I like to keep up with right lane traffic. I would get 19.5 mpg highway solo and 10.5 mpg towing 5,500lbs. This was one of my best towing combos ever. I had a Honda Ridgeline that struggled to tow this trailer.

Does your 2017 have the 10 speed transmission or 6 speed? If I remember right 2017 was about the time Ford started using the 10 speed. I would think that the 10 speed would help.

I am kinda surprised that your mpg is less than 8 mpg. That Eco-Boost 3.5 engine sure does produce the power so it must also use more gasoline.

I would guess you would get better mpg towing a 6,000lbs travel trailer with the 5.0 V8. If you decide to get another truck I would get one with the 10 speed. Oh, they changed to V8 for more power from my 2011 which was powerful.
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Old 10-12-2021, 09:55 AM   #8
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The fuel usage is sounds normal for the speeds you are driving. The EcoBoost V-6 will use fuel like a V-8 when you are working it like a V-8. The simple solution is to slow down to a reasonable speed. Rv stands for Recreational Vehicle, not Race Vehicle.

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Old 10-12-2021, 10:45 AM   #9
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He is driving the speed limit.
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Old 10-12-2021, 11:10 AM   #10
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Quote:
Originally Posted by mistercee View Post
During my brief stint towing our 8300 lb. loaded TT with a '19 3.5 Ecoboost I averaged about 10 mpg...and that was primarily towing in Arizona. As others have said, the mph will make a difference. I stuck with 60-65 mph with that setup.

You mention some hilly terrain and using cruise....depending on the grade, I'm not a fan of using cruise as the tranny will downshift more to try and maintain the set speed, which will cost you some as well.

Finally curious about your tires being over inflated, are you saying that you are inflating them over max PSI? Why?
Pretty much my experience towing our 5800lb 25' TT w/ our 2016 3.5 Ecoboost. Seems to average 9-12mpg towing but have seen as low as 8-9 towing into the wind. I just second and third the opinion to slow down. I tow at 60-65mph as my TT tires are only rated for 65.

Rarely use cruise, unless flat and calm. Love the way my truck tows our trailer, don't really care what the mileage is when it works this well. People tend to obsess about mileage, WHY? You're either dragging your house behind you, or sitting inside it in your class A and pretty much everyone gets the same mileage. 7-12mpg whether you're towing with your gas truck, driving your class A gasser or 40' diesel pusher.

If it tows well, just enjoy the trip,

PS Love my 136l (36 gal) fuel tank.
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Old 10-12-2021, 11:22 AM   #11
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Quote:
Originally Posted by BC Nomad View Post
I am towing a 6,000 lb double axle Jayco travel trailer with a 2017 Ford F-150 Supercrew, equipped with a tow pkg (up to 10,700 lbs), and a 3.5L V-6 turbo. The tires on the travel trailer were recently replaced, and slightly over-inflated, and my truck tires are slightly over-inflated. I have a weight-distribution hitch and the trailer tows well. The load in the truck bed was minimal. While the terrain/highways in WI aren't flat, I wouldn't consider them all that hilly compared to what you might see out West. i (mostly) use cruise control on the freeway set at 70, and with the transmission set in Tow/Haul mode. Doing so, I am getting about 7.2 miles per gallon over a 240 mile trip. While I expected a significant drop-off from the 22 hwy mpg I get when not towing, I figured I would get somewhere north of 10 mpg, but not so. Am I doing something wrong, or is this about what I should expect? If I get a lighter trailer, say around 5,000 lbs., is that likely to help much, or only inconsequentially? Would an F-150 with a V-8 show less of a mileage drop-off based on what I'm towing?

Thanks in advance for the feedback.
It's not the weight of the trailer that is killing your fuel mileage. Pulling a billboard behind you at highway speeds is the culprit. Try slowing down or better yet, get off the interstate and hit the less traveled back roads. My RV experience became way better once I learned to slow down and enjoy the actual trip.
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Old 10-12-2021, 11:24 AM   #12
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Does this seem reasonable?

I do believe V8s will get better mpgs while towing. I have no issues with the TT V6, but when it comes to towing I want the heavy larger displacement V8 up front. IMO it makes for a more grounded, and stable feel going down the road, especially in higher windy conditions.

We are also towing just under 6k lbs, and we are always between 10.2 and 11.5 mpgs on calm days. This is in the NW where we can hit several major steep grades in one day. We also travel around 70 to 72 mph. This is the speed large trucks are also running. So I feel its safer than running at lower speeds, and having them passing you constantly.

The truck is a 1/2 ton Ram with the 5.7 V8, and at 70 mph it runs in 7th gear at 2,250 rpms. Actually, Ive gotten worse mileage at slower speeds in a lower gear. The truck just feels like it wants to run at 70.

With a 15 to 20 mph head winds the mpgs greatly suffer around 7 to 8.

Edit: The trailer also plays a huge part. You didnt mention the overall length, and height. In comparison ours is only 23, and is considered somewhat lower profile, with a front curved wall.
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Old 10-12-2021, 11:40 AM   #13
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3.5 Ecoboost will run 16-16 PSI of boost. Another atmosphere is 14.7 pounds. At full boost your engine is pulling fuel and air as though it was 7 liters. It isn't as simple as this, but you get the idea.
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Old 10-12-2021, 12:20 PM   #14
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You could take back roads at travel 45 mph. Plus you will get to see all the little towns alone the way.
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