VP C85 is a great fuel. 2 of my cars run on it, one roots blown, the other nitrous.

I leave it in the fuel system even over the winter with no issues. C85 has some good corrosion inhibitors, and makes more power than any canned 85 I've tried. Doesn't sweat up the motor like pump either. There is a yellowish, oily residue left in the manifold, and runners. I'm guessing it's the inhibitor, but whatever it is, there is no rust anywhere in the bores. Running meth, or pump E85 I'd always see rust at the top of the bores where the rings don't reach. The tuning window is wider than gas.