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That’s because the us has no pedestrian impact design requirements and people like grills.

How does either of those lead to less cargo volume for the same or larger length?

Lots of dead volume that isn't usable... unless you wanna smuggle drugs with these vehicles.

"No pedestrian impact design requirements" --> no need to design in crumple zones --> less dead volume that isn't usable.

"People like grills" --> Flat two-dimensional decoration on the front surface --> How would that affect dead volume in the interior?

Your arguments aren't making sense to me.