The CEL never came on. I checked everything that I could think of.
I took it to the dealer, and they played hit and mis with it. They pulled the spark plugs, and that's when I got the call: "Mr Jones, What kind of octane boost have you been running?"
As it turns out, the octane boost completely fouled the plugs, and left a nice red residue on them for Ford to not cover it under warranty. cost: $260.
Never use +104 octane boost again.
It's good to have my car back, and thankfully it wasn't anything inside the motor that let go.

