I had a cruze hatch loaner car for two days, drove it 430miles. I did mostly highway, I got like 41 mpg. The auto stop works ok, I just find in very annoying, so it saves 50 cents worth of gas my tank, I think it’s great to have it, but just give me a button so I can disable it, everyone wins.I for one love it. It's my favorite feature of my 17 cruze hatchback! Like another poster said you have to adjust your driving habits and quit trying to creep. Sitting in stupid stop and go traffic or at a light it saves minutes upon minutes of gas. I turn the AC off and crack the windows as I'm not going to melt in 2 or 3 minutes. Once I get going again I put it in eco ac. That's also why I'm averaging 38.8mpg the last 2 tanks. I wish it had a timer that counted the seconds auto stop was engaged with an estimate of fuel saved.
To all the people who say it's bad or they want it off, must be professional auto mechanics and know more than GM.