I was doing 14/10 IF for year before I realized it was IF. No biggie.
I usually do my run/ride in the morning in fasted state, sometimes up to three-hour ride, or two-hour run. These are not hard rides/runs. They are just steady aerobic workouts.
If I am riding with a group or know that I'm going to be doing harder efforts, then I will eat breakfast. Not eating breakfast and then trying to put out hard surges or doing hills is a recipe for getting dropped.