I can't find the answer in the manual which is "generic" for all models. One reviewer stated that with the AWD package on the GT models, all 4 tires are the same size. I know this is true for the all-weather tire option on 18" wheels, but what about the AWD with standard tires? Obviously the front/rear are different on the RWD GTs. but can someone who actually owns a GT AWD tell me if the AWD requires same size tires front/rear, or if they are staggered the same as the RWD.