I am having this same issue - I first noticed it last year on the way to the Dragon but the car ran so well otherwise that I ignored it. I took it today to have the wheels balanced & was told that all 4 wheels are bent. For the life of me I can't see any bends in any wheels and they don't wobble while I'm driving. Danimal suggested Road Force tire balancing & that is going to be my next step. I REALLY don't want to buy 4 new rims .....