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It is interesting how those Lie-O-meters make you feel real good until you do the calculations!! We average that 10 to 11 mpg with our dually and that's running a total weight of 23,000 to 24,000lbs and about 65 mph throughout our 12,000 miles last winter. Empty on the highway I average 19. I run a Spartan tuner, love the system and response over the last 2 1/2 years. I am happy, the truck is big, 10.000 lbs so can't expect miracles when you compare trucks half that weight that will only attain 23 to 25 mpg.
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