Indy, I do indeed BUT apparently not enough. I like to eat Accel gels and Cliff Blocks. I just finished reading a chapter in Nancy Clark's nutrition for cyclists book and she suggested eating every 30 minutes. I put this to the test this past weekend and it did make a big difference in performance. Prior to this I was eating every hour or so and not drinking enough. However, on my 38 mile ride I hit the same energy sag point at mile 31. I think part of it was that I wanted to be in a little bit of shade.