So true, the cooler months in the CRUZE only require 87 Octane in the 2014 Model. Summer months due to hesitation is well served with 89. 91 or 93 octane seemed to perform worse than the 89. I do not subscribe to the theory you must buy Top Tier as I see the same top tier station truck filling the non top tier station, and the price is even less at times. Means nothing to me, the Stooges sold "Burpoline" in the 40's and all Stations had/have their secret blend.Without checking my memory, I think the model year matters. 2011-2013 wasn't too happy with 87 when things got warm. I think 2014 on was fine. There was a recall for 2011-2013 with automatic transmissions that might have fixed this.
Top Tier assures you of minimum quality levels. Others might be ok, but the emphasis on "might".I do not subscribe to the theory you must buy Top Tier as I see the same top tier station truck filling the non top tier station