I've had my CX-7 for two and a half months now and i love the way it drives but, I consistently get real bad gas mileage around 12 - 13 miles per gallon. What's the deal? I drive approximately 50-50 city to highway not too heavy footed either. What would cause such low mileage? A/C has been on pretty much all the time, could that be it? I use mobil super 93 octane, could the 93 as opposed to 91 be it? any suggestions would be great. Thanks!