What is one method for conserving fuel while driving on highways?

Using cruise control when possible is an effective method for conserving fuel while driving on highways. Cruise control helps to maintain a steady speed, which can significantly reduce fuel consumption. When a vehicle operates at a constant speed, the engine runs more efficiently, allowing for better fuel economy. This is particularly beneficial on long, flat stretches of highway where speed fluctuations are minimal.

In contrast, fluctuating speeds, such as those from frequent acceleration and deceleration, can lead to increased fuel consumption because the engine has to work harder to speed up and will consume more fuel during those variations. Driving with the windows open can also create additional drag, which can decrease fuel efficiency, while maintaining varying speeds does the opposite of what is desired for fuel conservation.