SSHE question

[spkid]

On pages 148-149 of SSHE, the example discusses whether or not a hand is strong enough to continue with after the flop.

At the top of page 149 Miller states, "for a five out draw you need the pot to lay about 8-to-1 to continue."

I am probably wrong (as my post flop game definetly needs alot of improvement...) but I thought that with 2 cards to come and a five out draw you only need about 4 to 1 to call.
I thought that it was 8 to 1 with only one card still to come.

Can anyone help me here?

Thanks to any responses.