New GMC 3500 Dually

[Heading out]

Have a 2022 GMC 3500 towing a 337RLS under 12,000 lbs loaded. mileage so far average 8.9 mpg truck only has 11,000 miles. Might add if you can keep 65mph or under it will do better.

[Tim2542]

Two L5P’s now pulling a 310 over maybe 30,000 miles and I can say I get right at 10 mpg. I drive at 63 typically and mostly mountainous terrain. Speed will be the biggest factor. If you run at 70 be ready to pay for it. Id guess from experience there is around 3 mpg delta between 55 and 70.

[marine6805]

I am thinking you to be mighty kind with your 55-70 delta.
I would think more of a 5+ mpg delta.

[JoeHannaford]

I have a 2020 GMC3500HD dually, crew cab, long bed, towing 2021 310GK. Weight is about 15,500. Avg 10-10.5 mpg when towing. Have a 50 gallon Titan aux tank in bed so never have to fuel up when hauling.

[COGrandDes]

Looking at getting a GMC 3500 Dually (2024). Wondering what kind of mileage folks are getting - especially when pulling a 310GK-R. Thanks!

I have a 2022 GMC Sierra 3500 CC SRW AT4 long bed with the D-Max and love it. I pull the mountains of CO every time we leave the house. Mileage varies based on all types of factors so I don't worry about it nor really track it. Speed limits are higher in the west so I pull between 75-85 MPH. You will love the truck. My neighbor friend just got a 2023 Silverado dually to pull his race trailer and loves the power as well. Good luck!

[mwdilday]

I know it's not a GMC but my 2017 Ford F-350 Dually with a Powerstroke 6.7 towing a 17,500+ pound Cedar Creek 5th wheel (Yes I have a Solitude 376RD on order) for 306 miles from Virginia to Myrtle Beach, SC I averaged exactly 9.5 MPG. I was cruising about 65-70 on 95 south. That is pretty typical for my rig. I have seen between high 8's to 10 depending on many factors.

[lorend]

Does your 303 have the stock tires with a load range E ? I know my E tires have a speed rating of 81MPH. Is that one of the "lots of upgrades" in your signature?