> At the scale of Wikipedia (~10 billion pageviews a month), even a single byte saving can mean terabytes worth of bandwidth saved.

But does it really move the needle anywhere where it matters? If you are serving a million bytes in every response but you manage to trim a single byte from it, I don't think it is going to move the needle anywhere.

Sure it will save a terabyte when you have served a trillion responses. But in a trillion responses you are saving only one terabyte out of an exabyte of responses. That's not much!