I just started growing last year & my first 4 autos only produced a lil over 4oz, but with some help from guys like Justugh & Dr. Who, I got 13oz out of 4 auto's the next time around and I have been CONSISTENTLY getting 3oz per Auto ever since.
FFOF soil mixed w 20% perlite
5gal Smart Pots
Spydr600 LED Light (cycled at 18/6)
4x4 Gorilla Tent
FF Nutes
Nirvana AK48 seeds
Note: I actually get closer to 3.5oz, but I don't bother trimming the smaller buds because I always grow more than I need & I don't sell.
I love growing but I actually despise the trimming process