At what speed is a car most fuel-efficient?
2 Answers
Car speed is most fuel-efficient at 60-90km/h. Fuel consumption at low and high speeds: Both low and high speeds will increase fuel consumption. In daily life, traffic jams are the most dreaded, not only because they waste time, but also because, from the perspective of the vehicle, traffic jams not only increase the wear and tear on the car but also raise fuel consumption. Methods to save fuel: Control the speed. The economic speed is the speed at which the car consumes the least fuel when driving in direct gear or overdrive. Cars driving on the same road at different speeds will have different fuel consumption. Choosing the right gear and the action of shifting gears both significantly affect fuel consumption.
I've been driving my sedan to and from work, and I find that maintaining a speed between 60 to 70 kilometers per hour is the most fuel-efficient, especially when driving at a constant speed on the highway. Don’t think that driving slower saves fuel—when the speed drops below 50 km/h, the engine efficiency actually decreases, and frequent stops and starts consume even more fuel. In the city, driving around 50 km/h is acceptable, but the optimal fuel consumption is around 70 km/h. I’ve tested it with the onboard computer, and it can drop to 5 liters per 100 kilometers, whereas driving above 90 km/h significantly increases wind resistance, easily pushing consumption above 6 liters. Additionally, maintaining proper tire pressure is crucial; underinflated tires increase resistance and waste fuel. Regular vehicle maintenance, such as changing the oil and air filters, also helps the engine run more efficiently. Sticking to these habits can save a considerable amount on fuel costs each month.
