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Thread: Bad fuel economy
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08-31-2022, 07:46 PM #11
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The sweet spot for my combination is 65 - 67 MPH for ease of towing and fuel economy. When on secondary roads (US and state highways), we never exceed the speed limit - which is usually 55 - 65 MPH. On the stretches of Interstate, in Wyoming for example, where the speed limit is 80, I stick to my 65 - 67 MPH in the slow lane. Of course, steep grades and 45 MPH headwinds change things - as do 45 MPH tailwinds.
RobU.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
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08-31-2022, 07:59 PM #122019 GMC 3500 SRW Sierra Denali Duramax
2020 Reflection 315RLTS
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09-01-2022, 06:38 AM #13
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2021 F350 DRW 6.7, mine varies from state to state, elevation (we travel from MT to TX each fall) and "lead footishness"
I've had a bad as 8.5 into a head wind on level ground to 10.9 with a tail wind.
Average is 10 mpg all in all.
I might add, I didn't rotate the Michelins at the recommended 10k mark. I put 26k on the truck wither pulling a 5th wheel or truck camper with boat. Tire wear was uneven and now I have to put new tires on it.
Bottom line, rotate those tires! I should have done it much sooner.Last edited by Sportsdad60; 09-01-2022 at 06:40 AM.
2021 310GK-R - MorRyde suspension and pin box. Sumo Springs. Solar, 7k axles.
2019 Lance 1062 Truck Camper, 2 slides.
2021 F350 Lariat DRW 4x4 6.7 diesel, 10 speed auto, 3.55 diff-48 gallon fuel capacity
2000 F350 XLT HD SRW 2WD 7.3L diesel, 6-speed manual trans, 3.73 diff - Firestone Airbags-Bilstein Shocks. 82 gallon fuel capacity
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09-01-2022, 07:00 AM #14
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Inclines, any wind (except for a direct tail wind) and the percent of biodiesel in your fuel affects your mileage.
Location - Wherever the road takes us...Full-timers
2015 Momentum 380
2019 Ram Dually
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09-01-2022, 07:03 AM #15
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09-01-2022, 07:07 AM #16
My 2016 F350 had 3.73 gears and averaged 8mpg with our 399.
2023 Momentum 398M-R
2023 Ford F-450
SOLD - 2021 Reflection 311BHS
SOLD - 2017 Momentum 399TH
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09-01-2022, 07:24 AM #17
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So, all things taken into consideration, my mpg is not so different from most. Maybe I I'm just paying attention to it a little more as diesel around here is $5.29 per gallon, and not so long ago it was $2.89! I've also heard that diesel fuel is in high demand, so maybe they're blending at a higher rate of biodiesel.
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09-01-2022, 08:29 AM #18
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You're not just whistling Dixie! This spring we made a 3,650 mile trip (starting in southern NM, then AZ, UT, CO, WY, SD, IA, IL, IN, OH, WV and MD). Fuel cost for the truck was $2,171.40. Diesel prices have come down since then, though, and we won't be using the truck to tow the RV for the rest of the year.
RobU.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
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09-01-2022, 08:31 AM #19
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I average around 10.5 mpg with my setup. I do notice less mpg when I am driving in the central part of the U.S. Seems like they use a higher concentrate of biodiesel then the coastal areas.
2023 Chevy 3500HD CC SB 4x4 Dmax
2021 GD 320G with 8K axles
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09-01-2022, 08:41 AM #20
Anyone use any additives that they think helps with mileage? I use Optilube when I'm towing. I tried Hotshot also. I didn't notice much if any difference in mileage. I get about 8mph and try to stay 65mph or under.
2016 Ford F350 DRW King Ranch
2021 Grand Design Solitude S-Class 3550BH
Camp Sites - https://www.google.com/maps/d/edit?m...fw&usp=sharing
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