Another point is that the same frontal area can be configured in many ways (tall & narrow ranging to low & wide) but the interior *volume* is not the same for these. A square (or round) frontal area of a given size will, by definition provide more interior volume than a narrow rectangle.
If you consider the passenger space above the floor on the Murray cars, they are nearly square, which means they have more interior space than a low and wide design with the same frontal area.
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