Most cars have their most fuel efficient speed at around 80-100 km/h, but most main roads are 100-130 km/h in terms of maximum speed. Shouldn’t we change cars?
In: 5
The most efficient speed for your car is whatever speed you can sustain at lowest rpm while adding just enough gas that you don’t slow down. There are many “efficient” speeds depending on the situation. The most efficient low speed is basically 1st gear crawl, and most efficient high speed is whatever you can sustain with least gas oedal use on highest gear. Efficient driving also means slow acceleration.
Different cars have different speed where they are efficient.
Speed limits are set according to geometry, safety standards, road risks analysis, road conditions and road type. They have nothing to do with efficiency.
Of you want to be efficient, you use big machines with big motor to move loads of people; Like a bus. Or you use a small vehicle that is light with small engine that runs at basically at one speed and the loads of gears that achieve correct speed/torque levels at the best point on the efficiency curve.
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