for 60-80 mile rides how many bottles of whatever, or whatever, are you drinking? I know for everyone it is different but i always hear about 16-24 oz an hour...and in 95 degree heat even more. I know you're asking about food but hydration may be just as key of an issue as food intake.
regarding food, it all depends on how long the ride is... 2+ i'll have a cliff bar in about 45 minutes and nibble on fig nuttons every 5-10 miles. every 45-60 minutes beyond that i'll just add more cliff bar or home made stuff.
regarding hydration, I have two cages on my frame and a tri cage on the back of my seat that holds 2 more, so i always bring 4 bottles with me. I find for about a 50 mile ride I do i use 3 and into the fourth bottle, but will every 20 minutes or so pour cold cold cold water over my head and neck--i find this works great.