Villian is unknown. Does he have overs/fold his 8 often enough to fire twice?

$0.5/$1 No Limit Holdem
5 players
Converted at weaktight.com

Stacks:
UTG ($38.10)
CO ($116.30)
Hero ($100.00)
SB ($70.80)
BB ($99.00)

Pre-flop: ($1.5, 5 players) Hero is BTN
2 folds, Hero raises to $3, SB calls $2.5, 1 fold

Flop: ($7, 2 players)
SB checks, Hero bets $4.5, SB calls $4.5

Turn: ($16, 2 players)
SB checks, Hero ($92.5)?