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South Plains of Texas | The V-10 might accidentally match it on mpg when pulling a trailer but won't come close when just running down the road. I have an 09 with the 6.2 liter and 6-speed and it pulls good and averages about 15.7 running around the farm and everyday driving. I have a friend with a 6.0liter and it has the fuel management program that cuts off cylinders when on the highway and his will get closer to 18 in daily driving and 21 when only highway, but his won't run like mine will. That extra 30 hp. shows up. :) | |
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problems with 09 GMC
