Either i got a lemon, which is definitely a possibility, or there are significant issues w/ gmc as a manufacturer which is evident. the american car industry just won't do business differently but then again, they don't have to- they get bailed out by the government repeatedly. i leased this vehicle in october, 2012. the issues cited above, were related to 3 bad fuel ignition valves, they were replaced finally after i took the car back to 2 different dealers and nearly 6 months of complaining. the issue was when accelerating, the rpms would stick at around 5-6 when i was traveling around speeds of 45 mph to 60 mph. the transmission wouldn't shift into the next gear. this was highway driving, but will happen on 4 lane roads as well. during the same time frame, the stability of the car in ice/snow only worked if the tow package feature was turned on. otherwise, i spun out leaving our neighborhood going down a slope at speeds of less than 30 mph. dealer said it didn't make sense and did nothing. i just keep the tow feature on during snow/ice/rain. electrical issues, heating/cooling system wasn't working correctly, it wasn't heating unless the temp was put at 80 degrees. only thing dealer would concede was there was a kink in the hose. it's happening again- we have to set the a/c at 60 in order for it to cool the car down. very disappointed in this car. once again, the issue with the rpms and heating/cooling system is happening again. i'm paying off this lease early and hopefully will not get a penalty. this is a poorly made car. *tr