I feel much better with 40-70 carbs per day. On athletic days or not. This way it's always "go time" and I never worry about crashing or exhaustion. I don't have to watch my available glycogen for sugar-burning exercise.

I would never do sugar-burning exercise every day though. I'm with Sisson on "chronic cardio" where he talks how perhaps we aren't built to go intense for hours every single day, without health consequences.