I often do back to back days since my training has to be done in blocks. I have my son 50% of the time and so I train ONLY when I don't have him with me. That means a block of Wed-Sunday. I've also done races and events that are 2 days and much more as in Race Across America. While my advice may not work for you it works for me and maybe some of the other members on this forum.

But first some questions:

1. How many calories are you taking in pre-ride?

2. How many calories are you taking in during the ride? Specifically how many per hour?

3. How much do you weigh?

4. What type of fuel are you using? All liquid? Liquid and solids?

5. What is your typical post ride routine? Specifically how many calories do you take in and what type of foods are they?

6. What recovery strategy do you have for your legs?

7. What will be provided at the event? Can or should you bring your own nutrition and just use the water provided?

8. How long does it take for you to do a century?

9. Are there large groups where you might have the benefit of drafting especially the second day.

10. What is the elevation gain? A century with 10k of gain is a much higher caloric expenditure than a century with 3k of gain.

And now just a freebie-- What is your favorite decadent food?