| I just bought my 06 crew cab GMC with a 6" fabtech and 35" tires. I love the truck but one of the main reasons I bought it was due to my brother in law getting 18-22 mpg in his 07 2wd stock. I figured I would be closer than I am. My speedo is off and appears to be 5mph off at 55 aswell. Therefore my dic which has indicated 14.1mpg... figures out to be 15.38 (14.1/55=... .25636x60=15.38). Anyway, I would like to make the economy improvements such as tuner, exhaust and intake. but I contacted the local dealership and they indicated it would void my warranty. currently I am still under the 3yr/36k bumper to bumper and have the remainder of the 100k power train. I don't want to mess that up. Plus I really want to fix the speedo. The dealer quoted me $187 to flash the speedo. hell for that much I could just buy a nice GPS and operate from that! If anyone could provide me with some direction as to how everyone seems to be pulling these options off or if they just don't care about the warranty. thanks |