User blog comment:Lesanthosxia/Influence Points Spreadsheet: Screenshot Request (Mods and Admins note)/@comment-4199297-20120217015902/@comment-4199297-20120218143454

well, it looks like at least game time IP gets rounded up and if the sum of the components then doesn't match up with the total any more, it is taken away from the IP boost in the display. Even though a win based IP boost should be something "fixed" for a particular game type, I've seen for ex. values of 145, 144 and 143 for a normal game win-based IP boost. (most likely the actual IP gained from the boost was exactly the same, just not the display of it... : Or the following silly thing: custom game, lvl10, 34:55, 157 IP = 79 (game time) + 78(time based IP boost) even though the time based IP boost should be (and probably is behind the scenes) exactly equal to the game time IP in that case.