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I'm sure it varies person to person - I've got a sample size of 1 here. But I'd not put hard limits on anything like that. It was only recently the US (I think) updated their guidelines on athlete carb intake to 60g/hr (even though much more is possible with different carb types).
One interesting thing is that body shape has little impact on ability to process carbs - a guy like me could use less than a 50kg woman. It's very individual.
Once I get my British service station feeding down I'm going to have to look at what's commonly available in US service stations and then maybe try some of that. Should be interesting experiment :)
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.