This is a good book on the subject: http://www.amazon.com/Racing-Weight-.../dp/1934030511
There's nothing wierd or radical in there, it's all common knowledge for people who have been reading a lot of training litterature, but it's assembled in one place and laid out well.

Most people can ride more than they can run. I would rarely do more than a 2 hour run but that's a minimum length ride and long rides are 5+ hours. So cyclists burn more calories and would need to eat more to maintain weight.