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I think the answer to your question is: It depends if he's going to bet the next street. In no-limit you rarely get the immediate pot odds to catch your draw.
When you're a 5-1 underdog to make your hand on the next street, you will generally only call if you expect to make more money from your opponent on later streets if you do hit your hand.
E.g. Pot is $20, you are in position and have your opponent's $70 stack covered. He bets $10 on the flop into you and you've got a straight draw which hits 1 in 6 times (so you're a 5-1 underdog to hit). Now, you're only getting 3:1 on the pot, which means if your opponent isn't going to put any more money in the pot if you hit, that you can't call:
You win $30 at the cost of $10 1 in 6 times, while you lose $10 the other 5 times... which means you're losing $20 overall.
BUT... if your opponent will pay you off on later streets, then you are getting 3:1 on the pot AND $60:$10 = 6:1 on the rest of his stack. So if you hit on the turn you're getting 6 + 3 : 1 = 9:1.
You win $90 1 in every 6 times but lose just $10 the other 5 times.. which is a $40 profit.
I think the best way to approach pot odds and implied odds is to make street by street considerations. Work out what it is costing you to hit on the next street and how much more you think you can extract from your opponent if you do hit. If you miss on the turn, make the same considerations for the river.
In the example below, i'm getting 3.5-1 on the pot on the turn to catch my flush draw, which isn't enough. But, even though the board is a little bit scary, I expect to win if I hit a good % of the time. My odds of hitting the flush are 4.1-1 so i need to make some more money on later streets. In fact, since I need 4.1-1, I need the effective pot to be $4.10 to be able to call... it's $3.50 on the turn so I need to make an extra $0.60 out of him on the turn -- which I pretty much always expect to do.
PokerStars No-Limit Hold'em, $0.25 BB (8 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com
SB ($24.75)
BB ($30.95)
UTG ($24.75)
UTG+1 ($15.85)
MP1 ($28.75)
MP2 ($6.35)
CO ($26.10)
Hero (Button) ($32.25)
Preflop: Hero is Button with A , Q
3 folds, MP2 bets $0.50, CO calls $0.50, Hero calls $0.50, SB calls $0.40, BB calls $0.25
Flop: ($2.50) K , 9 , 10 (5 players)
SB checks, BB checks, MP2 checks, CO checks, Hero checks
Turn: ($2.50) 9 (5 players)
SB bets $1, 3 folds, Hero calls $1
River: ($4.50) 4 (2 players)
SB bets $1.50
Total pot: $13.50 | Rake: $0.65
EDIT: I rarely ever consider my 2-street odds, unless my opponent bets All-In on the flop where you're guaranteed 2 cards to hit.
Also, in the above example, i'm getting better than 4.1-1 but let's forget about the gutshot straight draw for the sake of example.
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