Owner's Manual
Page 435
...would wear one and one-half times as well on a specified government test course. A tire marked C may depart significantly from highest to variations in driving habits, service practices, and differences in road characteristics and climate. Traction Grades The Traction grades, from the norm ...is a comparative rating, based on the wear rate of the tire when tested under controlled conditions on the government course as measured under controlled conditions on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics....
...would wear one and one-half times as well on a specified government test course. A tire marked C may depart significantly from highest to variations in driving habits, service practices, and differences in road characteristics and climate. Traction Grades The Traction grades, from the norm ...is a comparative rating, based on the wear rate of the tire when tested under controlled conditions on the government course as measured under controlled conditions on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics....