I do one 100-120 mile ride per week and I find that if I can go for a 30 minute ride either later that day or first thing the next day then I feel like a rock star. It works for me. Just a suggestion.

I also (6' and 160lbs) have high requirements for calories and fluid. I have gone through metabolic and VO2 testing as well as had sweat analysis. I need 1 L of water an hour and about 400 calories - plus I take electrolyte tablets if it is hot.

So this likely is not the case for you but DO experiment and don't be afraid to try different things. Weight yourself before and after to ensure you are getting enough fluid. A 2% loss may be ok for some but too much for others. Statistics are guidelines not strict rules to follow. Hope that helps!