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: Fuel Mileage affected with lift latinoredneck 03-25-2008, 02:54 PM Hey I'm looking at buying a new 08 2500HD with a D-Max with a 6 in fabtech lift with BF Goodrich LT285/65R20 tires but I was wondering how much my mileage will be affected by the changes. I'll be using this truck for mostly highway driving with little to no towing. Anyone with the same set up? gmduramax 03-25-2008, 03:02 PM Um 285/65/20 seem a little narrow but anyways. I think you will loose a couple mpg latinoredneck 03-25-2008, 03:09 PM Thats what the truck comes with the RMT Offroad conversion. I'm hoping that I can go with 35's. rockymountaintruckworks.com big05duramax 03-25-2008, 05:11 PM well with my 05 duramax with a 6in lift and 35's i got like 18 mpg on the highway this past sunday. latinoredneck 03-25-2008, 05:13 PM did your fuel economy increase once the engine broke in? big05duramax 03-25-2008, 05:52 PM yes once my engine broke in i did jump a little bit | ||