It's not that simple
Depends on the position, the tourney & the level of the tourney & your stack or whether it's a cash session
A6 off is 90% time a fold for me.
In a cash game I'd only open something like A6off in Bu,CO or SB.
In a tourney so many factors come to play. But if you have a decent stack, there's no point in calling a raise or opening a pot with A6 off in early to mp.
Ace with a lower kicker is not a great hand. Specially to continue 3 streets in a pot. But it has its showdown value because of the ace which comes to play in short stacked game in tourneys.