I have had my car for a few weeks now. First a correction, it only has 5 'gears' when you shift the CVT in NORMAL mode, not six. Second, I am getting better mileage than earlier. I am getting 23-25 mixed and I got 30+ with mostly highway. My guess is that you can get 30+ on a level highway easily. Still love it. Motor Trend ranked it as a finalist in SUV of the Year, but it lost out to a $70+k Porsche. The Porsche can't be this much fun.
Same as in my Fun, Fun, Fun review. If your driver's window is not automatic up, check out the owner's manual to set it to automatic. This is a great, great car.
Now that I am learning more about using a combo of NORMAL when I need to REALLY accelerate and ECO the rest of the time, my gas mileage is fine. Thus no improvement to make it better.