My last flash for the 07.5 was the AZ and it has done very good for me. I will not re-flash it again. With the addition of the S67 Smarty I am as happy as a toad on a stool. I tow at 60hp with timing with turbo and tQ set at #4. This gives me 11.5mpg towing and I set it at 90hp for daily driving. I get 17-19mpg on overhead on hwy with no load. Overhead is .5 to 1.0mpg off from hand calc. 
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CumminZ NC
2007.5, QC-DRW 3500 BFT Laramie,Smarty S-67, Custom Line-X, 4x4, 4.10LS, 988s, 68rfe, AMSOil Dual-Gard Oil ByPass, PML, Cool Hose, MBRP 5", Aero 5050, Mobil1. Yukon free spin, 19.5x245 G647 12 ply Goodyear's - 37RLTSD Cedar Creek-Day Dreamer
My 2007.5 DRW Truck at www.CumminZ.com
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