For longer rides I have tried to eat at least a serving of Shot Blocks every hour, and there is Heed in my Camelbak, along with two bottles of Accelerade on my bike. I try and remember to stop to drink the Accelerade every 30 minutes or so, and of course have the Heed available for sipping all of the time on a long ride.

When riding loops, I try to construct my route so that I am back at my car about every 25-30 miles, and then I eat something like a Cliff bar, or a banana/PB sandwich. Both sit on my stomach well, and Shot Blocs sit fine, better than other things of that type.

I've read that it is important what you eat the first 3 hours of a long ride for that sets you up for later. It may be that I am not getting enough calories in those first couple of hours. I will admit that I find that I stop less often now that I am clipped in - am still retraining my body HOW to stop and it is easier just to keep going...