I rush my ass off most of the time. I have noticed patterns in engram drops. I'll send a rocket onto a group on my way through just in case. Funny thing is if I'm rushing and you are staying behind killing everything I don't miss our on anything. Don't know if other people realize this but your kills can drop engrams for me. I get them at the post master all the time. I spent months killing everything in sight. I'm getting more engrams by speeding through. I understand the logic of killing everything but rushing has proven far more productive for me. Besides that I'm playing for fun. There is nothing any engram can offer me any more. Nothing. I want nothing else from this game until HoW comes out.