8-Lug Truck Performance Duramax, 8.1L, and HD tech | Intakes | Exhaust | Tuning | Suspension | Drivetrain

DMax gas mileage?

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Old Dec 7, 2016 | 01:12 AM
  #21  
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From: Rogers, MN
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I've seen one of those trucks before, it was a 2wd work truck with a metal cargo bed thingy on it. Used for storage for tools or whatever the business was. 5.3 with 8 lug axles and bare bones as they come.
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Old Dec 7, 2016 | 04:38 PM
  #22  
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From: Virginia Beach,VA
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Originally Posted by Nick Beasy
Yessir....8 lug and 3/4 ton leaf springs.,.. I even went to dealership and had them print me out a build-sheet by entering my vin number into their database.....The badges say 2500 as well but no HD......Seems weird to put 3/4 ton heavy duty suspension and axle under it and then go and put the 5.3L w/ 4L60E powerplant in it......Pointless? I have a fuel efficient 2500 that overheats the trans if i use the HD suspension as it was intended...
Didnt think they would have ever put a 4l60 in anything bigger than a 1500, i have seen a few 99-02 non hd 2500s, but iirc all of them were 6.0s with 4l80, also saw a non hd 2500 one time with 6 lug axles, had 6.0/4l80 and hd springs, thought it defeated the purpose of having a 2500....
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Old Feb 24, 2017 | 01:09 PM
  #23  
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I have a 2008 new body crew cab long bed 4x4 2500HD LMM and I get 20+ routinely hauling *** everywhere on the highways of Texas.

I actually made a chart and its dead on for my truck.

23mpg @ 70mph
20mpg @ 75mph
18mpg @ 80mph
18mpg @ 85mph
14mpg @ 95-100mph

Thats a DSP5, DPF delete w/ 4" exhaust with muffler, 35" tires, stock 3.73 gears, FASS pump, pacific trans cooler.

So, basic mods.
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