My current CX-9 is a 2011, previously I owned a 2008. My 2011 has the Info option and I have mine set on average MPG. My mileage is all over the place, seriously depending a lot on what fuel I put in it. My GT likes Chevron and the new Costco blend with the detergents added for some reason.
My mileage can range from 24.9 to 18 mpg. I live in Phoenix and we are now over 100 every day so the AC is on at all times, consequently I get 19 on average with mostly urban freeway driving. I took a run to Tucson, about 120 miles, before AC was necessary and I got 24.5 the whole trip. So, as the saying goes: your mileage may vary