me and my wife just looked at a used 2007 cx7 with 16,000 miles on it.we loved the way it drove and the power of the vehicle.i came home and started researching the vehicle like i allways do when im about to spend $17,000.00 on a vehicle.do you have to use higher ocatane or can you use 87 octane without having engine problems?what are most people getting gas milleage wise city driving?what can i expect?is there any difference in the 09 cx7 and the 07 cx7 with the way the vehicle will handle lower octane useage?thanks for your help..stan