I thought the theory was that a body can ABSORB about 250-300 cals/hr. It is quite easy to BURN much much more than that. At race pace, I can burn 750 cals/hr according to my Polar. At a more relaxed pace but not recovery pace, I'd be in the 500 cal/hr range. So, you're going to be working with a deficit even if you do eat during the ride, but your pre-ride meal will get you somewhere on shorter rides. Also affecting motor skills and muscle cramping are electrolytes. For a ride of 50 miles, I will generally eat about 600 calories mostly from carbs on the bike, plus lots of water and electrolytes. For a 30 mile ride, I'd be fine with about 200. Of course, terrain and pace play a big part.
I do tend to eat more on the bike than most of my training buddies, but I feel that I really need it. Plus, I have a hard time maintaining weight when I'm training a lot, and I'll still finish a ride with a huge calorie deficit.
I prefer Clif bloks for most of my food. Sometimes Clif bars on longer rides, but it can be hard to eat "real" food sometimes. I tend to race with a Clif electrolyte drink instead, and I may add that to my usual food consumption in the summer, because I have a problem with cramping when it gets really hot.




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