jm ñ' î+·UaÒ]f¼#ËyXbýÇ4/HTuUvL°Found it. We're guessing on the average. Shouldn't we be using the median, because it's a better indicator of the actual "average" value? https://bitcoinfees.cash/ uses median.
https://whatsonchain.com/tx/c227551ac2a7a154764b73d38d4f6aa2d59781faa0ab684ebfb40b3186a4f5aa