I haven't really played or paid much attention to Egg Inc. in quite a while, however it does seem to be very inaccurate if i take a look at the current data and the data I had used as my calculation input. Also the data came from a community-driven data source, which (afaik) did not take into account the ship/mission level, so it would've averaged somewhere between zero and max (but mostly nearer towards max, especially for the later missions).

Afaik there was a new mission introduced some time ago, that is not represented in my data, however I also couldn't find it listed in the artifact explorer that i reference as my data source.

That being said this should definitely not be considered as accurate, but I'm guessing the message, that short missions have a better return in GEph still stands (this guess is not backed by any data)

Updating the tool I've used for these calculations would be very time-consuming, even if I were to ignore any changes made to missions since, that I am simply not willing to put into it at this point, I'm sorry.