Power will drop quite a bit on regular and everything will be retarded. Mileage will also drop as I have seen the on multiple other cars over the years. Just gas up at Costco as its a tier 1 product and your premium will be cost of Reg on the street. You bought a performance vehicle right?????? Pass on the Starbucks and feed the car what it wants.
2018 Alfa Romeo Stelvio TiSport EC Phase 2 w/V2 intake, Remus Catback ~390HP / 442ft-lb Tq Visconti Verde, Chocolate Interior, Quadrofoglio wheels w/PZ4's
2016 Maserati GranTurismo Sport Custom blue tone, Grigio chrono leather w/full interior MC Carbon Fiber trim, NA 4.7L Ferrari V8, stock...for now
2016 Range Rover Sport HSE 3.0SC tuned by ETG 456HP/414Tq, Montalcino Red, Ivory
2012 Maxda MX5 Miata GTPRHT True Red, Black
2011 Lotus Evora S Persian Blue,Black Suedetex (Track specialist)