[BrenBarn]

But what if you apportion the fuel usage over the items transported? Presumably the ship carries far more items than the truck.

[OrderlyTiamat]

This is already taken into account: Shagie's table is based on [1], which is per kilogram-kilometer

[1] https://climate.mit.edu/explainers/freight-transportation

[eru]

I suspect they are underestimating how efficient ocean shipping really is.

[OrderlyTiamat]

Do you have any basis for that which I could refer to in discussion?