Have you checked for uneven wear on your tires, recently?
Wheel alignments adjust the angles of the wheels so they are perpendicular to the ground and parallel with each other. This increases the life of the tire, and allows the car to track straight on a level road which increases gas mileage.
At Barry’s we have computerized 4 wheel Alignment system to balance your car’s wheels we use a computerized Hunter Tire and Wheel analyzer. When a wheel or tire has heavy spots, it will cause a vibration as you drive, especially at high speeds. A measured lead weight will be used to balance the tire and allows it to spin without vibration.