(Update: I mistakenly confused the 20 percent discount with the bonus tag sales that GM often runs. This goes to show that even people who do this all the time can have a hard time keeping various rebates and incentive plans straight. I was contacted by a GM sales rep and I have some great news. According to him, every single 2017 Chevrolet SS sedan qualifies for the 20 percent off sale through 3/13/17)
Note, the Jalopnik article says March 31, but Chevy.com says the 13th.