Modern VW engines perform better with higher octane according to VW claims. Full hp numbers are achieved with premium fuel.I use premium or e85 in my tuned cars and regular in the Taos. I actually like the fact I can use regular.
unless you have modified the car use whatever it tells you to. Simple . Adding premium is a waste of money
I believe I do feel a little less oomph on a cold engine starting uphill on this tank of 87, when I usually run an 89/91 mix. I was wondering what might be different this week. Gas was so expensive I felt like I could save a few with 87 this time.I might just fill up with premium ethanol free next time for grins and see if I notice any difference. It's not like I'm driving much anyway just now so I can splurge for a tankful.