My commute from my previous house was 6.8 miles, with moderate climbing for the second half. I ate a somewhat smaller than normal breakfast (cereal or oatmeal) and fruit, I can't have coffee that close to riding time or it's big trouble. So i would get my coffee at work and also, bring something else to eat after i arrived, usually protein. Then I would eat half of a Clif bar before going home. BTW, I know someone who for years has done 5:45 AM spin classes with no food before. She decided to go out for a ride this way one morning last summer and was found by the police, by the side of the road, totally bonked and unconscious (yes, she was wearing a helmet). So, be aware that a little change in what you do may require a change in your eating habits.