Originally Posted by
revchuck
From what I've read, your need for carbs
does go down, because your body burns proportionately more fat as you gain fitness. I should be able to source this, but I'm home with the flu, and that's more effort than I'm willing to put forth right now.
Not really. Your need for carbs only goes down if you get fitter but continue to ride at the same speed. Most people will ride faster as they get fitter or as Greg Lemond used to say "it never gets easier you just get faster" or something to that effect.