forgot to add this.
probably best to reset your ECU when you change fuel mixes. That forces your ECU to relearn a new fuel map for the new mixture. It will learn what mixtures to use at what load/rpm/temp, etc.
If nothing else, pull the battery cable off and attempt to start the car for a moment to clear it out.
if anyone wants to email me anything,
66mustangdriver@gmail.com
I also work at OReillys Auto Parts...so I can likely get some good info from companies or our tech data at work. So yeah. Feel free to shoot me a message sometime.