I can't find the source, but doing one of the more recient Chrysler minivan redesigns they built a full adjustable "cabin" for the front seats. They could move everything around and then brought in 100s of regular drivers to position it where they thought it was most comfortable to both drive and ingress/egress. Supposedly the average was within a few centimeters of the original 1984 van. So either that's what people got used to, or they just nailed it in 1984.
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