What is the main advantage of energy-saving tyres?

• A. Increased rolling resistance
• B. Reduced rolling resistance
• C. Greater tread depth
• D. Less tread depth

Answer: (B)

Energy-saving tyres are designed to reduce rolling resistance—the amount of energy lost as the tyre deforms and resists motion as the vehicle rolls. By using optimized compounds and construction that deform less and waste less energy as heat, they require less engine power to keep the vehicle moving. That drop in rolling resistance translates directly into lower fuel consumption and fewer emissions, which is the core advantage.

So the best choice reflects this reduction in rolling resistance. The other ideas aren’t the primary benefit: energy-saving tyres aren’t defined by more or less tread depth, and increasing rolling resistance would defeat the purpose of saving energy.