Which statement best describes the benefit of downshifting to a lower gear on hills?

Which statement best describes the benefit of downshifting to a lower gear on hills?

• A. It reduces air resistance
• B. It provides engine braking to help slow the vehicle
• C. It increases fuel economy
• D. It shortens braking distance by tires alone

Answer: (B)

Downshifting to a lower gear on a hill gives you engine braking—the engine slows the wheels as you descend. This lets you control your speed without relying solely on the foot brakes, helping prevent brake overheating and fade and making the descent safer and smoother. The other ideas aren’t the main effect: gear choice doesn’t change air resistance, it isn’t primarily about improving fuel economy on descent, and braking distance isn’t shortened by tires alone without the engine helping slow you as well. The key benefit is using the engine to help slow the vehicle.

Downshifting to a lower gear on a hill gives you engine braking—the engine slows the wheels as you descend. This lets you control your speed without relying solely on the foot brakes, helping prevent brake overheating and fade and making the descent safer and smoother. The other ideas aren’t the main effect: gear choice doesn’t change air resistance, it isn’t primarily about improving fuel economy on descent, and braking distance isn’t shortened by tires alone without the engine helping slow you as well. The key benefit is using the engine to help slow the vehicle.