Which of the following road surfaces will help you achieve the best fuel efficiency?

Achieving the best fuel efficiency is strongly associated with road conditions that allow for steady, uninterrupted travel. A flat, multi-lane highway provides a smooth and even surface, which reduces rolling resistance and allows vehicles to maintain a steady speed without frequent acceleration or deceleration. This is crucial because each time a vehicle accelerates, it consumes more fuel, and a flat highway surface minimizes these fluctuations, contributing to optimal fuel usage.

In contrast, other road surfaces, such as rocky terrain and mountainous roads, often require frequent changes in speed and power, leading to increased fuel consumption. Similarly, gravel roads can create more drag and resistance due to their uneven surfaces, which can also negatively impact fuel efficiency. Thus, the benefits of a flat, multi-lane highway in terms of maintaining a consistent cruising speed without the challenges posed by varying terrains make it the best option for fuel efficiency.