I purchased a 2011 Fit 2 weeks ago. I was looking for a small hatch that could hold my mt. bike and gear. I was really surprised at the amount of room in the back when the seats are folded down. I can get my bike in there with both wheels attached. I got the Sport and I dig the looks. So far I'm getting around 32 mpg combined. It has 340 miles on it now. How long does it typically take to break them in and see an improvement in mileage?