I've been running the Eliminator 20% since last summer. I haven't tore an engine all the way down yet but I have opened up one that's been running Wildcat and it's very clean inside - no gum, gunk, or buildup of any kind. I haven't even had to change a glow plug since I've been running Wildcat.
Overall, I'm pretty happy with the fuel. I plan to stick with it at least until I finish the case I've got now.