User Tag List

Page 1 of 4 123 ... LastLast
Results 1 to 10 of 37
  1. #1
    Site Sponsor Dale G's Avatar
    Join Date
    Jul 2017
    Location
    Jackson, MO
    Posts
    526
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Mileage towing a 337RLS?

    I have a 2021 Ford F-350 SRW CCSB 4x4 Lariat Ultimate with 3.31 gears and the 6.7 diesel and I am currently towing an Imagine 2670MK, which weighs 8100 when we are fully loaded, and I get in the upper 11’s to lower 12’s towing at 70mph. I am getting 20 to 22 not towing at 70 to 75mph. This winter we are thinking of selling the Imagine and buying a Reflection 337RLS. What kind of towing mileage is everyone getting towing this camper with a similar truck?

    Thanks for the info,
    Dale
    Dale & Tammy
    Retired U. S Army and Retired Helicopter Pilot
    2021 Ford F-350, 6.7L Diesel, 4x4, Lariat Ultimate
    2018 Grand Design Imagine 2670MK (sold)
    2022 Grand Design Reflection 337RLS

  2. #2
    Long Hauler
    Join Date
    Jul 2021
    Location
    Platte City, MO
    Posts
    4,706
    Mentioned
    59 Post(s)
    Tagged
    0 Thread(s)
    Generally speaking, since everyone tends to drive differently and trucks are different, you can probably expect between 8-10 mpg. Depending of course on wind, travel speed,
    rate of ascent/descent, trailer weight, etc.
    Howard and Peggy
    2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
    His: 1999 Honda Interceptor
    Hers: 2013 Spyder ST-S

  3. #3
    Fireside Member
    Join Date
    Sep 2020
    Posts
    90
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Mileage towing a 337RLS?

    Quote Originally Posted by Dale G View Post
    I have a 2021 Ford F-350 SRW CCSB 4x4 Lariat Ultimate with 3.31 gears and the 6.7 diesel and I am currently towing an Imagine 2670MK, which weighs 8100 when we are fully loaded, and I get in the upper 11’s to lower 12’s towing at 70mph. I am getting 20 to 22 not towing at 70 to 75mph. This winter we are thinking of selling the Imagine and buying a Reflection 337RLS. What kind of towing mileage is everyone getting towing this camper with a similar truck?

    Thanks for the info,
    Dale
    One data point… I have a 2019 F-250 Lariat ultimate with 3.55 axles, similar to yours, and I tow a 303RLS, which tends to run 800-1200lbs lighter than the 337. With the 3.55 my truck has a sweet spot for towing mileage around 65-67 mph, I think the 3.31 would move that to about 72-74, until weight becomes a factor. Over the past year and 6000 miles, criss crossing the eastern US, I have seen 9.9-11.3mpg, depending on wind conditions, usually between 65-72mph. I don’t think the 337 would be much different, it is only marginally heavier and has an almost identical w ind drag signature, same height and width, and identical front cap.

    Every report I have seen on the 2021 with a 6.7 and the 10 speed says the power is as good or better and the mileage is slightly better, than mine with the 6 speed torque shift.


    Sent from my iPad using Tapatalk

  4. #4
    Long Hauler
    Join Date
    May 2014
    Location
    NW AL/NE GA Mountains
    Posts
    2,083
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    I would expect you'd get 11 mpg.

    I have a 323BHS and my old 7.3 F250 with a tuner gets 20 mpg on the highway. Put the trailer behind it and it gets about 11 mpg.

  5. #5
    Site Sponsor Jerryr's Avatar
    Join Date
    Nov 2016
    Location
    Florida
    Posts
    2,822
    Mentioned
    30 Post(s)
    Tagged
    0 Thread(s)
    I have a 2020 F350 CCSB 6.7L w/3.31 rear.

    I tow my 337RLS @ 62-65 mph. I get between 10-12 mpg, depending on headwind or tailwind.

    It usually stays in 10th gear and occasionally drops to 9th gear but unless I look at which gear it’s in I don’t notice it.
    Jerry & Linda
    Emma & Abby our Mini Golden Doodles & JR our Amazon Parrot
    2017 Reflection 337RLS, Build Date 01/2017, Titan Disk Brakes, Goodyear G614s 235/85/16 G Rated tires
    2022 F-450 King Ranch Ultimate, 4,868 lb Payload, Bedrug Bedliner, Andersen Ultimate II Aluminum 5th wheel hitch
    http://visitedstatesmap.com/image/FLGANCSCsm.jpg

  6. #6
    Site Sponsor Dale G's Avatar
    Join Date
    Jul 2017
    Location
    Jackson, MO
    Posts
    526
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hoopy Frood View Post
    Generally speaking, since everyone tends to drive differently and trucks are different, you can probably expect between 8-10 mpg. Depending of course on wind, travel speed,
    rate of ascent/descent, trailer weight, etc.
    I was hoping that 8mpg would be the worst mileage (headwind, climbing long hills). Towing my current camper I get up to 12.5 flat terrain and no wind so I figure I will lose about 1.5mpg with the heavier trailer and higher profile.
    Thanks for the information,
    Dale
    Dale & Tammy
    Retired U. S Army and Retired Helicopter Pilot
    2021 Ford F-350, 6.7L Diesel, 4x4, Lariat Ultimate
    2018 Grand Design Imagine 2670MK (sold)
    2022 Grand Design Reflection 337RLS

  7. #7
    Site Sponsor Dale G's Avatar
    Join Date
    Jul 2017
    Location
    Jackson, MO
    Posts
    526
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by SabreDriver View Post
    One data point… I have a 2019 F-250 Lariat ultimate with 3.55 axles, similar to yours, and I tow a 303RLS, which tends to run 800-1200lbs lighter than the 337. With the 3.55 my truck has a sweet spot for towing mileage around 65-67 mph, I think the 3.31 would move that to about 72-74, until weight becomes a factor. Over the past year and 6000 miles, criss crossing the eastern US, I have seen 9.9-11.3mpg, depending on wind conditions, usually between 65-72mph. I don’t think the 337 would be much different, it is only marginally heavier and has an almost identical w ind drag signature, same height and width, and identical front cap.

    Every report I have seen on the 2021 with a 6.7 and the 10 speed says the power is as good or better and the mileage is slightly better, than mine with the 6 speed torque shift.


    Sent from my iPad using Tapatalk
    That is interesting that you talk about the sweet spot for mileage towing. With this trailer, in calm winds, I actually get a little worse mpg if I slow to 65mph or less. A lot of times I am getting the best fuel economy at 70 to 72mph. I have a feeling it is where the rpm falls at those speeds. When I get to 70 the engine rpm is right at its max torque and never down shifts out of 10th gear unless it is a long hill.
    Thanks for sharing your information,
    Dale
    Dale & Tammy
    Retired U. S Army and Retired Helicopter Pilot
    2021 Ford F-350, 6.7L Diesel, 4x4, Lariat Ultimate
    2018 Grand Design Imagine 2670MK (sold)
    2022 Grand Design Reflection 337RLS

  8. #8
    Site Sponsor Dale G's Avatar
    Join Date
    Jul 2017
    Location
    Jackson, MO
    Posts
    526
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bamaman View Post
    I would expect you'd get 11 mpg.

    I have a 323BHS and my old 7.3 F250 with a tuner gets 20 mpg on the highway. Put the trailer behind it and it gets about 11 mpg.
    That is pretty impressive with the 7.3. My dad had one and it never got that good of mileage. Must be a really good tuner program. I am thinking I should get 10 to 11 in perfect conditions and a good coat of wax to reduce wind friction
    Thanks for the info,
    Dale
    Last edited by Dale G; 09-04-2021 at 06:55 AM.
    Dale & Tammy
    Retired U. S Army and Retired Helicopter Pilot
    2021 Ford F-350, 6.7L Diesel, 4x4, Lariat Ultimate
    2018 Grand Design Imagine 2670MK (sold)
    2022 Grand Design Reflection 337RLS

  9. #9
    Site Sponsor Dale G's Avatar
    Join Date
    Jul 2017
    Location
    Jackson, MO
    Posts
    526
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jerryr View Post
    I have a 2020 F350 CCSB 6.7L w/3.31 rear.

    I tow my 337RLS @ 62-65 mph. I get between 10-12 mpg, depending on headwind or tailwind.

    It usually stays in 10th gear and occasionally drops to 9th gear but unless I look at which gear it’s in I don’t notice it.
    I have noticed the same thing that it rarely downshifts. When I first bought the truck I was worried that it would be constantly downshifting and I would have to lock out the top gears, but that has not been the case, great engine, transmission, rear end combination. When we went from Missouri to Flagstaff this summer it very seldom downshifted even though it was pulling uphill most of the trip. Have you ever driven 70 to 72 to see what mileage you got at the higher speed?
    Thank for sharing your information, your combination is almost exactly what mine would be. Now I just need to sell my current camper after our last trip this fall.
    Dale
    Dale & Tammy
    Retired U. S Army and Retired Helicopter Pilot
    2021 Ford F-350, 6.7L Diesel, 4x4, Lariat Ultimate
    2018 Grand Design Imagine 2670MK (sold)
    2022 Grand Design Reflection 337RLS

  10. #10
    Site Sponsor 50ST8R's Avatar
    Join Date
    Oct 2020
    Location
    Illinois
    Posts
    115
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    To play devils advocate for those who drive their trailers over 65, the Goodyear tires are only rated to 65mph. Just sayin’


    Sent from my iPhone using Tapatalk
    Kevin & Deb. 2021 Reflection 320 MKS
    2018 Ford F-350 Diesel SRW Platinum
    Kevin and Deb. 50ST8R
    2021 Grand Design Reflection 320 MKS
    2018 Ford F-350 SRW 4x4 Diesel Platinum Edition

    [/SIGPIC]

Page 1 of 4 123 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

DISCLAIMER:This website is not affiliated with or endorsed by Grand Design RV, LLC or any of its affiliates. This is an independent site.