2021 Silverado RSTThe 2021 seems like a really nice truck.. Only issue is as mileage has been about 15% worse on my 2021, 5.3-8pd as compared to my previous 2016 5.3 6spd even though they were rated the same. The engine seems to rev more at takeoff before it starts moving. Z71 8 spd - 1 year old. Dealer just updated ECM and TCM. There were no recalls or bulletins.. Two updates for TCM #18YN91159541 - #FDYN91160264 and one for ECM #11YN91161788. Dealer said they have no idea what they are for. Does anyone have any details? Is yours updated?
