Ethanol question (E10): Give the oxygen content in the ethanol, does the pre-catalysis 02 sensor end up richening the mixture at closed loop? I know on a carburetor you be running lean across the board, but with the excess oxygen in the fuel, I was thinking things would level out on a Lambda controlled FI system. My car's tail pipe is usually gray-black soot, not light grey like a ford truck. I am afraid to run it WOT, because I dont know if its open loop at WOT or not. (Toyota Yaris 1nzfe with wideband lambda control)