Did you know a car travelling at 80kph (50mph) uses half its fuel to overcome wind resistance

Here's a breakdown of how speed affects fuel efficiency and wind resistance:

• Wind resistance increases with the square of speed. This means that as your speed doubles, the wind resistance quadruples (2 x 2 = 4). This is why fuel efficiency suffers significantly at higher speeds.
• At highway speeds (around 80 kph or 50 mph), overcoming wind resistance can account for a significant portion of the fuel used. Estimates vary depending on the car's design, but it can be somewhere between 25% and 50% of the total fuel usage.

So, while it might not be exactly half, overcoming wind resistance does become a major factor affecting fuel efficiency at highway speeds. Here are some additional points to consider:

• Lower speeds: At lower speeds, engine inefficiencies and rolling resistance (friction between the tires and the road) play a bigger role in fuel consumption.
• Car design: A car's aerodynamic design can significantly impact wind resistance. Streamlined cars experience less resistance and achieve better fuel efficiency.
• Alternative factors: Other factors like weather conditions, tire pressure, and cargo weight can also affect fuel efficiency.

Overall, you're right that wind resistance is a major factor in fuel efficiency at highway speeds. It's a good reminder to maintain moderate speeds for optimal fuel economy.