The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and one-half (1 1/2) times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.
Honda Civic Owners Manual. Warranty Coverages
U.S. Owners
Your new vehicle is covered by these warranties:
New Vehicle Limited Warranty - covers your new vehicle, except for the
emissions control systems and accessories, against defects in materials and
workmanship.
Emissions Control Systems Defects Warranty and Emissions Performance
Wa ...