Air resistance affects the fuel consumption of a vehicle. What affects air resistance the most?

Air resistance is primarily influenced by the speed of the vehicle. As speed increases, the aerodynamic drag against the vehicle also increases, leading to higher fuel consumption. While the number of passengers and the profile depth of the tires can affect fuel efficiency, they do not have as significant an impact on air resistance as speed does. In the context of German traffic laws, understanding these factors is essential for promoting environmentally friendly driving practices and optimizing vehicle performance. Being aware of the effects of speed on fuel efficiency can help drivers make informed decisions that align with both safety and economic considerations on the road.