I need some help from people who know, in addition to what my local service reps say. Situation Part 1: My RFTs on the front are shot and I had to replace them...now...with the pneumatic Contis I wanted. So now I have new tires on the front and the rear tires come in next week. No change in tire size (other than tread wear). Situation Part 2: It's a 2006 330xi...AWD and the normal interplay between the front and rear tires. Situation Part 3: I have to go 400 miles this weekend, almost all of it at highway speeds. Question: Does the tire mismatch pose an issue for the drivetrain? If I drive it for distance, at speed, am I going to create a problem? Or should I just park the car at the airport and take a rental for the weekend?