premium fuel

I can't find the 2015 owner's manual online, but per the 2014 manual: "For vehicles with a 2.0L engine, use premium unleaded gasoline with a posted octane rating of 91 or higher. Regular unleaded gasoline rated at 87 octane or higher can be used, but acceleration could be reduced, and an...

I just bought my new Verano Turbo automatic. It feels really smooth to drive and I am happy with it. Its almost time for my first fueling and I am wondering if I should really go for premium fuel. Someone did any comparison of the MPGs on regular (89) and premium (91) fuel ? I know there are...