I tried a search on this but apparently this forum's search feature is a bit lacking. It didn't like the shortness of the term "gas".

Anyways, I still have yet to put any fuel in my 2011 QX56. I'm still on the tank of gas that came with the car. Will be fueling up today and plan on filling it up with Premium 91 Octane here in Salt Lake City.

Anyone tried mid-grade or regular unleaded?

I use 93 octane premium.

Read the manual, near the back of it you will see stated that you should use premium fuel. Go to Costo if you can, about 20 cents cheaper for 91 oct.

93 premium only

Only premium.