I ride 11 miles one way to work. I don't eat or drink anything until after I get to work. In the summer if the temp is > 85 degrees or so, I will bring some water with me.
As has been said, if you do eat something, then you really should wait. I want to get the heck to work, because the sooner I get there, the sooner I can leave again.
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Work: the 8 hours that separates bike rides.