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Old 02-25-2021, 07:51 PM   #15
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I don't have the 5th wheel yet but did a 450 mile round trip through the mountains (including 2x over 10,000 ft). Must say I am impressed. 21.2 mpg and most of the trip spent in 10th. Let's see how it goes with the trailer tomorrow.
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Old 02-25-2021, 11:51 PM   #16
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SRW trucks pulling trailers under 18k lbs equipped with the 10 speed will pull a little better as well as get better fuel economy with 3:31 gears than with 3.55 gears.
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Old 02-26-2021, 05:16 AM   #17
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I just logged about 2k miles on a 2021 F350 longbed with the 3.55.

Fuel mileage was over 20mpg when cruising at 70 mph. Around 18 mpg at 80 mph. Mountain West to Nebraska.

Overall the most impressive stat is the RANGE. I could easily squeeze 800 miles between fillups, over 900 if I tried. That 48 gallon fuel tank is no joke.
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Old 02-26-2021, 09:14 PM   #18
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I've watched this argument play out on several forums and the thinking is the 3.55 has to be way better. No offense intended but probably many of those giving the advice have not owned or even driven an F250/350 with the new 10 speed transmission. As an owner of one with over a years worth of experience behind the wheel towing and not towing, I'm telling you the new transmission is a game changer.

I opted for the 3.31 because we do take some long trips solo and I was hopeful it might give me a little better mileage. The gearing is close enough that I didn't think there would be that much difference when I'm towing our 14,700 pound, loaded for a trip, Pinnacle. Our prior truck was a 17 F350 dually towing an Excel fifth wheel that weighed about 1500 more pounds. Maybe not a fair comparison but the new 20 has a smoother and more powerful feel than the 17 did. It gets up to speed with the Pinnacle very quickly and unless the inclines are fairly steep it holds 10th gear very well. There is absolutely no gear hunting. It just downshifts to where it needs to be when the conditions call for it as is the case for most trucks.

I would say that either ratio will work for whatever you want it to do within the trucks limitations, of course. If you will use it for nothing but towing maybe the 3.55 is the better choice but do not be afraid of the 3.31. I've posted this before but here is a picture of my trip meter for a 722 mile trip to Chicago last October to help my sister-in-law remodel her house. I had my wife, mother-in-law and a bed full of tools for the trip. I'm happy.
Pretty constant to owners I know, 20-21mpg. My 15 with the 6 speed 15 on a good day with the 3:55's 11 towing 14K. Got me thinking maybe a new F350 w/ the 10 speed.
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Old 02-27-2021, 06:17 AM   #19
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Pretty constant to owners I know, 20-21mpg. My 15 with the 6 speed 15 on a good day with the 3:55's 11 towing 14K. Got me thinking maybe a new F350 w/ the 10 speed.
I had a 2019 with a 6.2 gas motor. I'm actually shocked at how much better the mpg are with my 2020 350 srw diesel. I consistently get over 20 on the highway. I've averaged 22-23 on long trips.
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Old 03-03-2021, 07:12 AM   #20
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I think Ford got it right with the 6.7 and 3.31 and 10 speed trans. I just drove to Wisconsin to pick up a new 25' Airstream. On the trip up from Ocean City Md we averaged 21 mpg at speeds up to 70. On the trip home ( 1103 mi ) we got 15.1 mpg 60-65 mph, trailer weights about 6000 lbs dry. The truck held 10 gear on the flat and going up mountains in WV and Pa. The truck is a 2020 F250 CCSB XLT 6.7 PS diesel we had no WDH or sway control on this trip and no issues.
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Old 03-06-2021, 08:54 PM   #21
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I think Ford got it right with the 6.7 and 3.31 and 10 speed trans. I just drove to Wisconsin to pick up a new 25' Airstream. On the trip up from Ocean City Md we averaged 21 mpg at speeds up to 70. On the trip home ( 1103 mi ) we got 15.1 mpg 60-65 mph, trailer weights about 6000 lbs dry. The truck held 10 gear on the flat and going up mountains in WV and Pa. The truck is a 2020 F250 CCSB XLT 6.7 PS diesel we had no WDH or sway control on this trip and no issues.
I'm thrilled with my 2021 6.7 diesel with 3.31 gears. If my truck is staying in 10th while climbing mountains with my trailer in tow I would want a higher speed ratio. (I realize that 3.31 is the highest we can get)
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Old 03-11-2021, 11:20 PM   #22
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You guys are making my palms sweat in anticipation of wrapping them around my new F350 Tremor's steering wheel in a month. If you don't know it comes with 35" tires and the 3.55. Most everyone is posting numbers virtually identical to yours on the Tremor forum. The guys who got the 7.3 Godzilla are only seeing 14-15 mpg on the road and
9-10 towing!
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