I did my longest and hardest ride this year today 41.5 miles holding an average of 15 mph. Drank 4 water bottles full (1 with electrolytes), ate a sticky bun (substitute for pie) in a neighboring town, and found some hills I didn't know were there. Headwind for 10 of the last 11 miles was not appreciated, but did build some character.
Good news is that I don't feel dead. Hence, I can do RAGBRAI if it started tomorrow. I should be in good shape for it given two more months to get used to the heat (and eat more pie .