Grolby, eating a bigger dinner earlier the night before is not a bad thing to 'top off' your system so to speak. People carbo load for a reason.

I do agree that you should eat a little bit bigger of a breakfast a few hours earlier if the race is a lot longer, or do what gary said and have a normal breakfast with a snack between that and the race. Carry more food than you think you need during the race. Gels/cliff bars etc. Honestly, you should be training longer than your longest races, so you should have the nutrition stuff dialed in from that.