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

Air resistance is influenced primarily by the speed of the vehicle. As speed increases, the force of air resistance grows exponentially, which in turn affects fuel consumption. While factors like the number of passengers and tyre profile depth may have minor effects on overall vehicle aerodynamics, they are not as significant as speed. Understanding these dynamics is important for efficient driving and adherence to emissions regulations in Germany, which aim to minimize fuel consumption and environmental impact. Therefore, while your focus on speed is correct, considering all aspects gives a more comprehensive understanding of how to optimize vehicle performance and comply with traffic regulations.