Before the 1990’s cars were boxes with lots of sharp edges. Rounding the corners did a lot for aerodynamics and fuel efficiency, but other factors like safety and practicality are important. Having the motor at the front protects the passengers in a crash. Having a box shape means maximizing the internal volume compared to the “footprint” of the car. Holding more stuff and passengers compared to the size makes the car more efficient in a different way.
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