Even though i know experience is just a gimmick, lets compare our experience points (race age) aquired within -one- game. To make for good comparision, proportions shouldnt be included, only games/mods which allow for roughly as fast progression as stock does.
My best is a devnull mod game, high tech cost, 3 planets medium start, lasting for about 1,5 years with usually 2 turns per week.
Unfortunally i deleted the modfolder just days ago, but i had 17 ringworlds, 620 colonies, 240 million population (+20% racial modifer
)
and more stuff, overall i had 425.000 experience points
My best result, by far.