Just got back from my 1st test drive of a 2020 St, grey, 19,000 miles, did not have the upgraded tires/brakes. I just pushed the button and drove, didn't think about a particular mode, exited I guess, so I am sure I was not in sport, asked the sales person if regular or premium was in it and he seemed to think regular, keeping in mind that my daily driver is a 2017 Cadillac 3.0, Cts V sport Twin turbo, stock, I was totally under whelmed by the lack of power. Maybe not being in sport mode, definitely the regular gas, had an effect on the power. Is their a boost gauge on the sport screen ? The I pad looking tablet definitely is not as big as it has looked on the many video's I have watched. I guess all of those video's that I watched were everyone commented on how it pulled and how quick it was had raised my expectations, oh well. They have a 2021, black w/the tire/wheel/brake upgrade package coming in, he will call me, I am going to make sure they have premium in it for my test drive. Any input would be appreciated.