At what speed does a car achieve the best fuel efficiency?

2 Answers
VonElle
07/29/25 1:48pm
Most gasoline-powered vehicles achieve optimal fuel efficiency at speeds between 60-90 km/h, while a few perform best between 90-110 km/h. This depends on factors such as the vehicle's drag coefficient, engine technology level, transmission matching, etc. Methods to save fuel are as follows: 1. Control speed: The economical speed is when the car operates in direct drive or overdrive, resulting in the lowest fuel consumption. Driving at different speeds on the same road leads to varying fuel consumption. Only at a specific speed does the car achieve the lowest fuel consumption. Therefore, driving at medium speed in automatic or high gear can save fuel. 2. Select the appropriate gear: Gear selection and shifting actions significantly impact fuel consumption. When starting, choose the gear reasonably based on load and road conditions. If you feel insufficient power while driving, downshift promptly instead of solely pressing the accelerator, which would increase fuel consumption. During gear shifting, be quick and precise with your movements. This shortens the distance traveled during shifting, achieving the goal of saving fuel.
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Riley
08/13/25 5:06am
What is the most fuel-efficient speed for a car? I've asked myself this question many times. From my years of driving experience, the most optimal range is between 80 to 100 kilometers per hour, especially cruising at around 90 km/h on highways. Why? Because the engine operates smoothly at this speed without wasting fuel. At lower speeds, the engine lingers in inefficient zones, while at higher speeds, increased wind resistance consumes more fuel. The vehicle type also plays a role—my compact car performs best at 85 km/h, whereas a large SUV might be slightly higher. I also pay attention to regular maintenance, like keeping tire pressure optimal and changing engine oil periodically, which significantly optimizes fuel consumption. Remember, sudden acceleration or braking increases fuel usage, so maintaining a steady speed is the most efficient way to maximize each tank of fuel.
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