Want to know how to get the most out of your egg incubators?
Starting out you are given an unlimited use Incubator and as the game progresses you will receive some limited use incubators (3 uses each).
In order to get the most out of your incubators try to save the limited use incubators for your 10km eggs. And always use 2km eggs in the unlimited use incubator.
Why waste the extra incubator on just 6kms, when you can ride it out for 30kms???
And since there is currently no way to get rid of eggs, except for hatching them you will want to always have the unlimited use incubator working on your smallest km eggs so that you have more room available in case you find a 10km egg.