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Duramax Sixth Generation: 2017+ (L5P) Discuss the sixth generation (2017+) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 08-05-2017, 09:18 AM   #1 (permalink)
Steve J
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3500 DRW vs SRW MPG

I am thinking about buying a new 3500. I can pull what I need to pull with a SRW but I am considering a DRW, actually a DRW with a flat bed.
I am curious what the MPG difference is between SRW and DRW unloaded and loaded. Both have 3.73 rear end.

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Old 08-05-2017, 03:12 PM   #2 (permalink)
redwngr
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Can't help with the mpg comparision, but, FWIW, all L5P pickups come equipped with 3.73's, including the fleet and CC models.

Generally the 6.0 (L96) pickups come with 4.10's and the GM (as opposed to Allison) transmission. Some fleet and CC model gassers are available with 3.73 or 4.10.

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Old 08-05-2017, 09:11 PM   #3 (permalink)
Steve J
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I drove a DRW with a flat bed today at the dealer. The wind noise off the rear window rack was very loud and according to the DCI the Fuel mileage was not very good to me. 14.5 MPG at 78 MPH on the highway with no load. Dealer is going to locate a 3500 SRW for me.
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Old 08-05-2017, 09:59 PM   #4 (permalink)
BanksLB7Duramax
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Quote:
Originally Posted by Steve J View Post
I drove a DRW with a flat bed today at the dealer. The wind noise off the rear window rack was very loud and according to the DCI the Fuel mileage was not very good to me. 14.5 MPG at 78 MPH on the highway with no load. Dealer is going to locate a 3500 SRW for me.
If you think 14.5 MPG at 78 MPH is bad mileage then you shouldn't buy one of these trucks. . . . .
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Old 08-06-2017, 01:31 PM   #5 (permalink)
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The flatbed will get worse mileage than the pickup box, poor aerodynamics of the bed not blending with body lines, headache rack and wind noise, how much of a drop, probably one to two miles per gallon, so 18 without and 16 with, pulling a trailer, probably no difference.

When I was shopping for my new truck, I would have ordered a cab/chassis if I could have gotten one with the LBZ package. The cab/chassis is much narrower than the dually pickup. I have no regrets with my 3500 SRW, but I am close to the max tire ratings on the rear axle when hooked to my new 5er.
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Old 08-17-2017, 11:46 PM   #6 (permalink)
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May not help much but my 2012 LML 3500 srw would get 19 to 20 highway. We took a 1500 trip with our 15 LML Denali dually and averaged a little less than 17. Most of the trip was 70 to 75 mph on interstates. Pulling our 15,500 pound fifth wheel the 2012 usually averaged around 11, the dually comes in around 10.
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Old 08-18-2017, 08:35 PM   #7 (permalink)
Steve J
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Thanks JDT

I have about decided I am going with a 3500 SRW.
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Old 08-18-2017, 08:49 PM   #8 (permalink)
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SRW will suffice unless you need the added weight carrying ability.

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Old 08-19-2017, 08:07 PM   #9 (permalink)
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I have no regrets about buying my 17 SRW 3500. Next week I will take a trip to Saskatchawan to go fishing, towing my 2500 lb boat, we will see how it does on mileage, but I am guessing it will average around 15 to 17 mpg.
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2018 Solitude 310GK fifth wheel with a 12' Haulmark tag trailer to haul toys in.

1997 Jeep TJ, Currie 8.8 high pinion axles front and rear with ARB air lockers, 4.56, 5 on 5.5 with warn hub kit, Atlas II transfer case with Klune V doubler, 4 inch Currie Lift and 35x12.50x15 Mickey Thompson MTZ on 15x10 Mickey Thompson wheels, Ramsey 9500 winch, hydraulic ram assist steering, on board welder and on board air, custom aluminum fuel tank.
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Old 09-22-2017, 12:48 AM   #10 (permalink)
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My 17 dually is averaging 13mpg at 6300miles. I'm proably at half towing and half empty there. I also took off the front lower valance because it go ripped off in the mud. Truck looks meaner without it tho lol

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