I experimented with this today and have now hatched 4 eggs, each 5km. Here are the steps to easily rake in the mileage.
- Set phone brightness to 0%
- Set your display to never turn off
- Plug it in, you will eat up your battery
- Leave the game open and sitting still
What seems to be happening is the GPS is pretty inaccurate so I have been watching my trainer slowly pace around in circles all day and hatching my eggs with no effort. I think being on wifi helps increase the GPS inaccuracy, but I cannot say for sure.
This also seems to work somewhat while driving. On my pretty heavy traffic commute to work, I left the game running and was able to get some distance traveled. I’m assuming it no longer counts distance once you pass a certain speed. So, while slightly inching forward in traffic I am still getting some distance traveled.
Edit: After a bit more testing, this trick becomes more effective the worse your connection gets. I have a good wifi connection in my apartment, so I don’t get much pacing. As soon as I got to work where I have a much worse connection, one of my eggs hatched.
