Sitting in the middle would not give better vision when you are overtaking another vehicle. That is the situation in my experience when there is a significant difference between the driver and passenger position.
To have center driver in a regular car the width of the car would need to be increased for 3 person in the fromt or the same width and persons in the from.
For racing all trave in the same direction, only the driver is in the car and have a equal center of mass is relevans so then a driver in the center is a good idea. But for regular driving it is not.
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