Took my 06 in for a checkup today as my mileage was lousy. Talked with several dealers here in socal and nobody admitted to any tsb's. Finally spoke to service rep at Glen Thomas and he said there were several for my truck... just bring her by and hed have his tech plug her in. Man what a differerence... . she's shifting smoother and into high gear way quicker than before. Used to have to hit 2000 before a gear change, now if there is no load she shifts at 1200 to 1500. overhead hs never been over 13. 5 unless I drive 55 and then it shows only 15. 2. Was allready at 14. 5 running 65 down the freeway for a couple of miles and stayed above 13 around town. Oo. They did not give me any flack about my tru-flow intake. Roktech muffler or Kore suspenion kit either, course I'm not having any mechanical problems either. The dealer i bought my truck from just kept saying more miles, more miles. I was considering a triple dog to see if mileage would pick up but the flash seems to work.