I sure wish they would! I have a sneaking suspicion that the transmission programming may be the same for more than one model that Chevy makes. When the dealer was checking out my Aveo for my transmission complaint, they gave me an HHR to drive as a loaner car. I swear that the transmission in that shifted at the same (late) points as my Aveo. (I hated that HHR and was very glad to get the Aveo back.)