In my continuing experiments to figure out how my body works, and to optimize my riding, I went on my standard 60 mile ride yesterday and only drank water (and had a cup of coffee en route). I also had some of my DIY Endurolyte powder. My breakfast was two eggs and two slices of bacon a few hours before the ride, and a cup of coffee (my doping) just before heading out. I had cream in the coffee but no sugar.
I'd recently concluded that perhaps I wasn't eating enough during my rides, so I expected this one to be a tough experience, with lots of suffering towards the end.
Not so. I had a really good ride, and felt strong right until the end. My speed was slightly higher than during the last normal ride, and I climbed the hill at 40 miles slightly faster than usual. I intentionally kept my heart rate low (my max is 160 BPM).
I realize that there's a lot of random variation in how I feel on a ride, but this suggests that what I eat on the ride isn't as important as I'd thought.