I am a big supporter of Rule #7, and very glad to see it in the list. If you're over 6 feet tall, you have virtually no leg room in economy on today's planes. If the person in front of you reclines, you have so little leg room you cannot normally move. I get you want to be more comfortable, but reclining won't help all that much, and it can cause serious issues for those behind you.
And another thing. Why is it that when people recline, they "pop the clutch" and throw the seat backwards, giving you no warning and no ability to move your knees out of the way? If you choose to recline - and I can't stop you - then how about a little consideration in how you do it? And once you've reclined, you need to understand that every time I move, I will likely hit the back of your seat. I don't mean to, but I am so squished there really is no way to stop that. If it was up to me, the recline function would be disabled on all economy class seats.
If we only think of ourselves when flying, then it will quickly become even more unpleasant for everyone.
Here endeth the rant.