Put 20 oz of Techron complete fuel system cleaner in a full tank. Let the cleaning begin. Come to think of it, I think I poured one in 2018 (3500 miles ago) when I got the car. So right on time.
I have only filled Shell V-Power NiTRO+ Premium on the Porsche.
The station right next to me used to be a Chevron but they switched it to an Exxon just before I got the Porsche. However, I started going to Exxon for the other cars since they have a new premium gas.
https://www.exxon.com/en/synergy-supreme-plus
As much as I love Costco for anything, I don't care for their fuel. I wouldn't put that in a premium car. I do randomly fill it up on my beater 16 year old camry. In fact, I got a check engine light twice after I filled up at Costco and it went away after I filled a new tank at Shell. Go figure.