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  1. Duramax Seventh Generation: 2020+ (L5P)
    I picked up a Black Diamond Denali on the 4th and drove it 220 miles home. On the trip there my 17 Denali got 19mph on the way there driving about 80mph. On the way home i got 13. There wasn't any wind either. I know it needs to break in a little but it's not going to come up 50%. I'm at...
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