I was thinking of adding a hitch to my CX5, but wanted to get some feedback on how much it impacts the mpg from people who installed it. Mainly when there is nothing attached to the hitch, not when you are actually hauling stuff. I was thinking of getting the Curt 13127 Class 3 Trailer Hitch which adds about 40lbs on the car. I'm mainly going to be using it to attach a bike rack when I want transport my bike. I won't necessarily have the bike rack attached all the time. Any feedback would be appreciated.