I do a fasted 25 mile ride several times a week. I generally eat my usual breakfast before my routine weekly century and the 70 mile or so ride the next day. Lately, I have been eating only protein bars on the long rides. Pre-COVID I would do a 150 mile ride per week with a full meal at about 75 miles. I don't want to eat at restaurants right now, so that's out. The meal thing worked for me, but I don't think I'm typical, so don't try this at home.