Which of the following actions can help save fuel while driving?

Avoiding rapid acceleration and hard braking is a key practice for saving fuel while driving. When a driver accelerates quickly, the engine requires more fuel to increase speed rapidly. Similarly, hard braking often leads to a loss of momentum, which means the driver will have to accelerate again, consuming additional fuel. Smooth driving characterized by gradual acceleration and deceleration helps maintain a steady speed, allowing the vehicle to operate more efficiently. This method effectively maximizes fuel economy by minimizing the amount of fuel used during these driving actions.

Other choices might not offer the same benefits; for instance, driving at inconsistent speeds can lead to inefficient fuel use as the engine works harder to frequently adjust speed. Keeping windows open at high speeds can create drag, which can reduce fuel efficiency as the vehicle works against the wind resistance. While using cruise control can maintain a steady speed on highways, relying on it in all situations is not always beneficial, especially in hilly terrain or when dealing with varying traffic conditions, where adjusting speed might be more fuel-efficient.