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What I race on is 90g CHO x 4cal/g = 360 cal and some people have done well at Ironman racing on 120g/hr = 480cal. So I'm not sure I'd limit myself to 300 if I could get away with more.
hippy-
Interesting. I expect you've looked into it more than me. I researched it a bit after doing my first 24 and realised I had no clue how much I should eat, nor did my helper. I found the 300 cal number and have latched onto that since. Gs of CHO is better but I find it easier to guestimate how many cals in x. I've used that on all my long TTS and audaxes since and never bonked. Obvs 300 (or 480) is only an average so different people can metabolise more. Ideally I shd experiment to see how I go with more, but never have got round to it.
frank9755
What Hippy said, but I just aim for 300 cal per hour, mostly from carbohydrate. That is the most your stomach can absorb, so no point eating more.