What is the real speed of WiFi class n?

Question

WiFi

There is a real speed, under normal conditions with walls and obstacles, the distance is within 10 meters, not the theoretical maximum.

Answer 1

Through one antenna without MIMO, you can squeeze out 75 megabits. I did not see more, no matter how I twisted the settings.

Answer 2

netgear 3500L gave a net 12.5 megabytes per second. I don't remember what kind of mimo there is. 300Mbps for advertising