Hansmb

I purchased 2013 c-max hybrid in Oct. 2012. Started off getting 43 mpg, the it dropped to 41, and has fallen steadily to current 38.9 mpg. I love the car, but am very disappointed in this. I don't drive like an idiot, tires properly inflated, use the coach and make sure to maximize those measures, get lots of leaves, etc. is this going to keep dropping?