vibration when you accelerate around 20 mph and up? not tires and diagnostic?

get a complete diag and est from a good shop or dealer,otherwise we would be guessing. if its drive train it should be covered under your 10yr 100k mile warranty

I recently had this. My u joint in the drive shaft was worn out. My local repair shop replace the bad parts and everything is good. I have 145,000 miles on my car.