Note that each tire manufacturer has its own rating methods. So a Goodyear tire rated at 300 will not necessarily give the same tread life as a Michelin tire rated at 300. It may last longer under the same conditions or it may not. The treadwear number is most relevant when comparing tires by the same manufacturer. The temperature resistance rating signifies a tire's heat dissipation capabilities.
Excess heat leads to premature tire failure, so cooler running tires last longer.
Torque A measure of the twisting force. The RPM at which the engine produces maximum torque is important. 5000 RPM, then Engine A will accelerate better at low speeds. Engine B will accelerate better at high speeds. A fluid coupling used in automatic transmissions to transmit power from the engine to the wheels.