I guess we are all different and need to find our own way with the nutrition and the bicycling.
My max ride is about 40 miles, but for a 20 or 30 mile ride, I generally eat nothing, and I drink little. For a 40 mile ride I would want a break with some food and water.
If I ate a huge breakfast, there is no way I could ride. My body would be so busy trying to digest all that stuff that I would have no energy left.
Another typical pattern would be a 20 mile ride, a stop at McD's for a fruit and yogurt parfait and a sausage burrito - about 350-400 calories - then a 45 minute swim, then another 5 miles or so.
That's what makes it so interesting - we are all so different.
So, you will have to find what works for you - and it may be quite different from what works for others.
Good luck and keep up the good work.
DnvrFox in Parker - 73.5yo, 215 lbs.