I think that filling the page with "i"'s where an "i" represents a whole byte of a data, is overcounting (as admitted in the article), so I tried with 3320 byte

I think that filling the page with "i"'s where an "i" represents a whole byte of a data, is overcounting (as admitted in the article), so I tried with 3320 bytes of base64-encoded data. Two pages and 2/3. (Replaced "/" with "_" as "/" made the lines to break too early.) Here, each letter represents 6 bits, so it's clearly undercounting. However the widths of the characters are a bit more realistic, as the narrow "i" is definitely overcounting.