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My longest run has been only about 17 miles or so, but I've never eaten while running, ever, it's not necessary for that distance. For a marathon it gets a little different, but maybe, 1 time an hour or so, go with gu. Something easy and quick to digest. Eating a bar every 45 minutes will get rather nasty as they sit there in your stomach after 4 or 5 or so.
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