[CardinalFlyer]

Although I recently put a new set of MICHELIN PILOT SPORT tires on my 6, I don't think it's an out of balance tire situation.

Last week I made my first longish trip in my 2014 650i convertible. I noticed tire vibration between 65 & 85 mph and noted that I'd have to get them rebalanced as soon as possible.

The day after I arrived in Asheville, NC, I had a high pressure fuel pump failure and ended up being towed to the local BMW dealership. While it was in the shop, I asked them to do a high-speed balance on the tires.

Driving back to Florida via interstate highways yesterday I noticed improved tire balance on flat and level roads, but something weird on inclines.

On interstate highways, I almost always set the cruise control, as I did yesterday. So on flat & level, as well as descents, no issues, but on inclines, there was a very noticeable vibration/shaking that seemed to go in and out of phase until I crested the hill. This would always happen as the cruise control adjusted power to maintain speed up the inclines.

So, I'm wondering what else it could be. So many things are rotating. Thought about engine and transmission mounts, drive shaft, U-joints, axels, etc.

I honestly don't know if this is a new thing as I haven't taken the car on a trip like this since purchasing it about 9 months ago. Anyone with similar experience?