Owner's Manual
Page 332
... example, a tire graded 150 would wear one and a half (1 1/2) times as well on the government course as measured under controlled conditions on General Motors passenger cars and light trucks may have poor traction performance. AA, A, B, C The traction grades, from the...following information relates to the system developed by the United States National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in road characteristics and climate. While the tires available on a specified government test...
... example, a tire graded 150 would wear one and a half (1 1/2) times as well on the government course as measured under controlled conditions on General Motors passenger cars and light trucks may have poor traction performance. AA, A, B, C The traction grades, from the...following information relates to the system developed by the United States National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in road characteristics and climate. While the tires available on a specified government test...