You have a CVT, belt transmission. The 2015 model uses a newer CVT chain transmission. With each new design designers are able to make the overall system more efficient, less parts, etc... Thus the slight improvement in mileage. Officially it's a 1 mpg improvement.I have the "7 speed transition. May build date 2013. I can only get 23hwy MPG
What changed that made the 2015 get better mpg?!?