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  1. #1
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    Bad fuel economy

    Hi. I have had my 2016 F350 diesel for almost 5 years. Oil changed every 5,000 miles, fuel filters done annually, air as needed. This summer pulling my 31MB I am averaging about 8.5 mpg when regenerations are included and driving 67 mph on the highway. My driving this year has been in MN, WI, and IA. What kind of mpg are you getting with similar truck and trailer? I didn't write it down but I thought I was getting better mileage than that last summer. Yes, I know it will improve if I do 60 mph. Just wondering.
    2021 GD 31MB; 2022 F350 Rapid Red, Lariat Ultimate Package, CCSB, 4x4, 6.7 Powerstroke, B&W 20K Patriot slider

  2. #2
    Site Team Second Chance's Avatar
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    In the midwest this spring, I got around 10.5 MPG with the rig in my signature (15.3K trailer weight per the scales). Have you had someone put the truck on a computer for a complete diagnostic?

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  3. #3
    Rolling Along
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    I get about 10.5 mpg at 65 mph with my Silverado 2500 Duramax towing a 312 bhts which is a TT but about same weight and length.
    2021 Reflection 312 BHTS, Silverado 2500 Duramax

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    Site Team Second Chance's Avatar
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    Quote Originally Posted by FlyStar View Post
    I get about 10.5 mpg at 65 mph with my Silverado 2500 Duramax towing a 312 bhts which is a TT but about same weight and length.
    Just a note - length doesn't really affect mileage and travel trailers, at the same weight, will usually result in a bit better mileage because they are not as tall as fifth wheels. Once you get a rig rolling, it's all about frontal area and wind resistance. Rear end ratios and the number of speeds in the transmission make a difference, too (my DRW has a 3.73 rear end and a six-speed transmission... I forgot to mention that).

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  5. #5
    Seasoned Camper
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    We average around 10 mpg with our 2013 F250 diesel. I keep speeds to 65 or less. Got 8.5 on Sunday going against strong winds. Pulling a 303 RLS.
    Mike & Linda
    303RLS
    2013 F250 Turbo Diesel Crew Cab

  6. #6
    Site Sponsor
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    Quote Originally Posted by Second Chance View Post
    In the midwest this spring, I got around 10.5 MPG with the rig in my signature (15.3K trailer weight per the scales). Have you had someone put the truck on a computer for a complete diagnostic?

    Rob
    How fast did you drive on the highway?
    2021 GD 31MB; 2022 F350 Rapid Red, Lariat Ultimate Package, CCSB, 4x4, 6.7 Powerstroke, B&W 20K Patriot slider

  7. #7
    Site Sponsor
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    Quote Originally Posted by Dakota View Post
    We average around 10 mpg with our 2013 F250 diesel. I keep speeds to 65 or less. Got 8.5 on Sunday going against strong winds. Pulling a 303 RLS.
    I did notice that when I drive about 60, the mileage is about 10 mpg.
    2021 GD 31MB; 2022 F350 Rapid Red, Lariat Ultimate Package, CCSB, 4x4, 6.7 Powerstroke, B&W 20K Patriot slider

  8. #8
    Site Sponsor Richter's Avatar
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    I have an F-350 diesel and tow a 303. I regularly get about 11.5 miles/gallon. Rarely over 65 mph, normally stay off the interstates, so we get a chance to see more along the way.
    Tom and Janice (known as Tom in PGH on the “other” forum)

    First came the 18' Comfort bumper-pull, was great for 20 years.
    Now a 2019 Reflection 303RLS, second air, double glass, table and chairs
    2019 F350 Lariat (Diesel) 4x4 Crewcab with lots of goodies
    Andersen aluminum with the puck system holding it all together
    Cranberry Twp. PA, about 30 miles north of Pittsburgh

  9. #9
    Long Hauler geotex1's Avatar
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    Quote Originally Posted by Joe1967 View Post
    Hi. I have had my 2016 F350 diesel for almost 5 years. Oil changed every 5,000 miles, fuel filters done annually, air as needed. This summer pulling my 31MB I am averaging about 8.5 mpg when regenerations are included and driving 67 mph on the highway. My driving this year has been in MN, WI, and IA. What kind of mpg are you getting with similar truck and trailer? I didn't write it down but I thought I was getting better mileage than that last summer. Yes, I know it will improve if I do 60 mph. Just wondering.
    You don't share what your rear differential ratio is. Huge part of this equation. You mileage does not fall outside of the typical range of towing a 5er...
    Rob & Nikki + Cloverfield
    2020 Grand Design Solitude S-Class 3350RL
    2015 RAM 3500 Longhorn Laramie Crew Cab, Long Bed, 4x4 Dually Cummins/AISIN

    Mountains of Pennsylvania

  10. #10
    Site Sponsor jasonl78's Avatar
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    I know you're more than likely looking for diesel comparisons but pulling my 28BH at 10K lbs with my Ram 3500 with 6.4L Hemi and 3.73 gears I see anywhere from 8.5 mpg to 9.6 mpg on our MN roads. Tow between 57 and 60 on two lanes and 67 on roads like 169 or 35W.
    2018 Reflection 28BH
    Andersen Ultimate Hitch ISR Version
    Predator 3500W Inverter Generator
    2017 Ram 3500 Mega cab SRW w/6.4L Hemi, Ramboxes, Active Air Rear Suspension
    2017 Aluma 8214HS
    2015 Lund Crossover 1775 XS

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