Oh yes, I've just thought: it's a good idea to try out the energy drink/bar/gel on rides before the big day so you can get used to the effect which in turn will help you anticipate how much and when to use them. It's also a chance to see what flavours you like and whether any of them have any, um, negative effects on your guts (which I've heard can happen but hasn't affected me*).
* Famous last words
* Famous last words
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