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?
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In general, you would want the car’s engine and transmission to be designed in such a way that it’s fuel-efficient at ALL speeds. Cars drive in cities at low speeds, and on the expressways at high speeds, and not everyone is going on vacation and driving on the expressway at 120 km/h the entire time. In fact, the most typical scenario is driving city speeds going to/from work every day, and on the highways, being stuck in the traffic slowdowns as you commute to/from work.
As far as the engine efficiency, it is a bell curve, and if the top of the bell is at 80-100, you have pretty good efficiency a little bit higher than that at 100-130, and a little bit lower than that 50-80 km/h (city speeds). You pretty much want to put the bell curve in the middle of your range of speeds, rather than at one end, so that the car is fuel-efficient at a good range of speeds.
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