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Race-morning breakfast is a rehearsal
Eat what you have eaten before a long brick. For most men that is familiar carbohydrate, a little protein, and not a new café experiment. Two to three hours before the start is the usual window. If the start is early, eat something small you have tested.
Coffee is fine if coffee is normal. A new gel in the parking lot is not. The gut learns by repetition, the same way the legs do.