Need tires for a '11 Shelby GT with the SVT performance package. Car came with Eagle F1 265-40-19 on front and 285-35-20 on rear. Are there any alternativeas sizes or tires for this vehicle?? Have 8K on tires and they are shot. At 400.00 a tire I think thats unacceptable. I'm not a very aggressive driver and think I should've gotten more than 8K. Any help is appreciated. Thanks