Yea, not a misprint. I run VP C25 race gas. Certainly wouldn't want to spray it. I've heard of people up to 18:1, but typically 15.5:1 to 16.5:1 is the sweet spot with todays gasoline. They just start making less power after that. I'm sure it has to do with detonation, and I guess when it comes to compression, it is the more the merrier until you hit the point of detonation.
I live up off of Home Rd. on the northern edge of Powell. I grew up closer to the city, and I miss it, but it is quiet up here.