We're talking different markets here.
Outside of America, it's not only cars that feature lower-displacement engines, bikes, too.
On the streets of most developing nations, a 250cc bike is already considered huge. Most bikes range between 100-200cc, with a big portion of cyclists driving 125-150cc motors. Delivery bikes are typically between 175-250cc.
Middle-class commuters typically drive 150cc bikes that get 80-90 mpg (US) and cost under $2k. A 150cc bike with one rider will get to 60 mph in the same amount of time as a typical 2.0 compact. A 250cc bike will hit 60 as quickly as most hot hatches and still get you over 60 mpg.
A multi-cylinder bike of 400cc or more will hit it in the same amount of time as a 300 horsepower sportscar. Apples and Oranges.
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