I've read a lot of threads on the 2014 and the tire balance problem. On my 2011, I've ruled out a wheel/tire issue, I was curious if anybody else had another component that contributed to a highway vibration. (axle, hub, etc.) I'm going out of my mind here.
I have vibration at 65-75MPH. I notice it mostly in the rear view mirror. I notice it when the out door temps are below 15F. I think it is a engine oil or transmission fluid temp issue. When driving down the interstate the oil will be around 160F and the tranny temp is 107F or below. Both are below what i believe to be normal. When I let the vehicle idle and warm up the vibration goes away until the temps fall back down. The vibration only occurs when operating in MDS. I have two sets of wheels. 20'' with Forteras and 18" with Silent Armors. So it isn't a tire issue. That is my 2 cents.