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False optimization usually. Modern 64-bit CPUs use a native 8-byte word w/ hardware support for 4-byte words. It's actually slower to use a 8-bit char/byte than a 32 or 64-bit int with one exception: storage or payload size. You're probably not dealing those latter issues here so stick to simple ints.
But like @i960 said, it's probably not going to help you much because of 32 or 64-bit word sizes in today's CPUs. It can help with file and database storage optimization though.