Final answer
If you closely watch your speed, you can save fuel. This statement is true because driving at a steady speed and avoiding rapid acceleration and braking can improve fuel efficiency.
Explanation
The statement "If you closely watch your speed, you can save fuel" is true because driving habits can significantly impact fuel efficiency. When a vehicle is accelerating or decelerating, it requires more fuel to maintain its speed. Rapid acceleration, in particular, can be very fuel-intensive.
According to the U.S. Department of Energy, aggressive driving (such as rapid acceleration and speeding) can lower gas mileage by as much as 33%.
On the other hand, maintaining a steady speed on the highway can help improve fuel efficiency. This is because cruising at a consistent speed requires less energy from the engine than constantly accelerating and decelerating.
In fact, the Department of Energy recommends driving at a steady 55 mph to maximize fuel efficiency on the highway.In addition to maintaining a steady speed, avoiding unnecessary idling can also help save fuel.
Idling for more than 30 seconds wastes fuel and contributes to air pollution. Instead, it's best to turn off the engine when stopped for an extended period of time, such as during a long wait at a traffic light or in heavy traffic.
Overall, closely watching your speed and driving habits can have a significant impact on fuel efficiency, helping you get more miles per gallon and save money on gasoline costs over time.