A main consideration when playing MT SNGs, especially 45mans+, is that to consistently be profitable, you need to be finishing in the top 3 vs just making the money, due to the steeper payout structure. With that said, you need to be chipping up and not trying to just make the money, only to go out in 6th or 7th because you have <5bb at that point.
Typically, the danger zone is 5BB or less because effectively, you have lost your fold equity. Therfore, you want to do your best to pick up blinds before this point occurs. Many times, if you have <5BB and the blinds are about to hit you, you will have to make a -EV shove just to conserve any fold equity that you have left.
Of course there are other factors involved (such as villain stack sizes and calling ranges), but let's say you have <10BB on the button, this could be an any two card shove to steal those blinds. You cannot just wait around for "good" hands to play because it could be too late. So those times that you are not picking up easy hands to shove, you need to stay afloat for when the blinds come through next, and typically that is done by shoving wide in late position to maximize your fold equity.
These are very broad statements, but programs like SNG Wiz and Nash Calculators can help you with shoving ranges. (Note that SNG Wiz will base calculations on cEV vs $EV when you are pre-final table).
Hope this helps.
Clint
