While driving at highway speeds in even mild wind or turbulent air from traffic the car has a loss of stability. the car was purchased in winter and as soon as conditions improved for highway speed to resume we found out.we do not feel the car should not be used for highway driving. when getting off the highway intermittently a vibration occurs as well as when traveling at 50mph occasionally feeling a drive line vibration feels like it comes from the right front wheel. so far the car has been to 2 dealers and they both acknowledge the issues and then say that this is proper that when driving a new focus from their lots they are the same.