I own a 2008, and have noticed that it is pretty jumpy over rough roads. Not sure which tires your car has - mine has the Yokohama Avid model. I can't say I love them, and believe they are a major source of the problem. It's annoying enough where I'm considering installing Michelin XGVs on it and trying to sell off my Yokos (only 5k miles on them - any offers?). The tread pattern is quite blocky, and that usually translates to a rougher ride. The XGV is much more a "touring" tire, with more longitudinal grooves and some fairly thin tread aspects for quietness. If I decide to take the leap, I'll report back if my theory is correct. I know the Toyo Proxes are quiet too, but when I got only 22k from them on my old ES330, I swore off them.