Size and supply usage

[tinkthank]

Am I correct in noting that supply usage = 1 * (Unit Size -1)? Makes lots of sense in most contexts.
Well I feel that Caelum is the Last race in the world to need help in any form, but it still bugs me that these large but weak creatures need so much food; it seems they should eat as much as a normal human. Can this be changed? (And what penalty should Caelum receive in return for this?)