I can ride for 1 1/2 - 2 hours on nothing but coffee first thing in the AM, but it depends on intensity. Similarly, that Noosa with walnuts and berries will run out a lot earlier if I do any serious climbing. But for my standard Sunday routes, even up to 67 miles I can go on the Noosa and 200 Cal at about the 2-3 hour point.
OH! I forgot about the bottles - a total of 240 Cal in drink mix between the two 24 oz bottles. So, that's, what - 440 Cal during the ride on top of the yogurt for breakfast.
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