[Taqwus]

As per the manual, yes.

The first additional point in a path costs either 8 (if you already have that path), or (new path cost). The additional ones cost (8 x (additional point number)) each -- ex.

Oracle starts with S3, so S3 -> S9 is 6 levels = 8*(1+2+3..+6) = 168. Oracle doesn't have water at all, so W9 from nothin' is (new path cost, which I don't remember) + 8 * (2+...+9).