Pot Odds vs. Pot Equity

[magates]

If you have 8 outs on the Turn (4.8 to 1) in a pot that contains 5BBs, and it is one bet to you (5 to 1), do you call or fold (you are last to act)?

Pot odds would say to call, but your equity in this pot is 17.4% of 5BBs (0.9 BBs), so you would be spending one bet to protect 0.9 bets by doing so.

I realize this difference is small, but it's confusing me nonetheless. What do you do when pot odds tell you to call, and pot equity tells you to fold? Do your implied odds make up the difference?