depends on what you like to mine... lots of factors to consider given the recent resource caps..
Tax excluded, what miners are reporting to me ranges from 93-98% returns... indoors excluded of course because it's impossible to measure that kind of volatility accurately.
I'm personally around 96% in outdoor mining altogether... but i don't mine LAs but maybe 5% of the time.
I'd say good rule of thumb is to assume you'll get 91% return.. any extra will be a bonus. I base my mining spots off of 91% assumed returns.
Consistency matters most i suppose. i believe in kickbacks, which is why some people achieve 91% return. when you bounce around a lot, go from indoors to outdoors before you hit big, and change amp size/drop cost a lot you won't do as well.