$11: When is this a good laydown?

[pineapple888]

Party Poker No-Limit Hold'em Tourney, Big Blind is t150 (4 handed) converter

Button (t2088)
SB (t275)
Hero (t555)
UTG (t5082)

Preflop: Hero is BB with 6[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds. SB is all-In.
</font>
Hero folds.


Final Pot: t425

Results:
No showdown. SB wins t425.

Under what conditions is Hero's fold +EV?