I was the sweep for a 30 mile ride today... not the usual crowd, only a guy and his wife, plus his adult daughter (20-25?) who is a new rider, but a fit runner. While they are AMC members, they are better known for being fast riders in the other club I belong to. Jack made it clear we wouldn't be racing, but the ride got really fast at one point, which was fine until we got 2 hills, one steep and one long-ish where I was climbing much faster than normal, which did me in. We stopped for a break shortly after that, and I said I was going to ride back to my car the shorter, flatter way, but they said no, they would tone it down. So, except for a part in the middle, it was fine. It's about 75 out, which is my limit for not feeling the effects of heat. We've had a few days of this temperature where I've ridden, but not enough for me to acclimate.
DH and I are doing a hilly 40 miler tomorrow, but I won't worry about speed, just fun.