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Great truck and you will love the duramax and Allison combo.. just keep up with your oil changes, dump the tranny fluid every 24K and use Transynd fluid .. only change out the external spin on filter when doing tranny fluid swaps.. also don't take to dealer and let them power flush tranny.. it's not needed, Go read info on Allisons web site...
I get 13.5 with my 2007 LBZ 4x4 club cab duramax pulling at 2014 Alpine at 62 mph
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