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Old 12-14-2018, 08:16 AM   #43 (permalink)
averey0
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Join Date: Sep 2014
Posts: 136

I've gotten as high as 20 or 21 all hwy on fairly flat ground. 19 with mostly hwy but a little stop and go and or slight hills. Now though with winter fuel i'm down to 17-18 in these same conditions. The current tank i'm on currently sits at 15.8 with mostly around town driving and maybe 20% hwy.
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2018 GMC 2500 SLT L5P Duramax
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