To control the amount of fuel added to a vehicle, it is crucial to understand and utilize various techniques that optimize fuel consumption. The primary methods include monitoring fuel consumption, maintaining vehicle efficiency, and adopting eco-friendly driving habits.

Firstly, monitoring fuel consumption is essential. By regularly checking the fuel gauge and keeping track of the distance traveled, drivers can get a sense of their vehicle's fuel efficiency. This information allows them to adjust their driving habits accordingly. For instance, if the fuel consumption is higher than expected, the driver can investigate potential causes, such as a leak or inefficient driving.

Secondly, maintaining vehicle efficiency is key. Regular maintenance, such as changing the oil, replacing worn-out tires, and keeping the engine tuned, can significantly improve fuel economy. According to the U.S. Department of Energy, a well-maintained vehicle can improve fuel efficiency by up to 20% compared to a poorly maintained one.

Adopting eco-friendly driving habits is another effective way to control the amount of fuel added. These habits include accelerating smoothly, avoiding rapid acceleration and deceleration, and maintaining a consistent speed. The U.S. Environmental Protection Agency (EPA) states that aggressive driving can reduce fuel efficiency by up to 33%.

Moreover, using the right fuel type is important. High-octane fuel is not always necessary for most vehicles, as it does not provide better performance or fuel efficiency. According to the EPA, using the correct fuel type can save drivers up to 5% on fuel costs.

In conclusion, controlling the amount of fuel added to a vehicle involves monitoring fuel consumption, maintaining vehicle efficiency, and adopting eco-friendly driving habits. These techniques not only help in reducing fuel costs but also contribute to a cleaner environment. According to the U.S. Department of Energy, the average American household spends about $1,600 per year on fuel, making efficient fuel management a significant aspect of personal finance and environmental responsibility.