It seems that specifying something less than
uint256 counterintuitively increases gas costs (or at best makes them equal to uint256 with optimization).
And since the minimum write to storage is 32 bytes (256 bits), it doesn't seem like specifying
uint8 would necessarily save you gas either.
In what cases could one use
uint<256 to save on gas?
One possible example: in a struct, if you group/list 8
uint32 variables together, would writing to those 256 bits (which presumably are stored consecutively in one word) be the same storage / gas cost as a single
uint256 in the struct?