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Kipchoge probably burned about 2500 kcal according to online calculators. Maybe slightly less in reality due to drafting off his pacers and having an exceptionally efficient running form.

Runners can drink anything they want as long as it doesn't violate doping rules. The elites all have customized carbohydrate mixes.

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Probably much less. It is not just running form that makes elite runners efficient. Due to both genetics and training, their bodies use fuel more efficiently, too.

Probably not much less. Physics is physics. I'd be super sceptical of any claim about efficiency of something like running being much different from person to person (happy to see any quality research that proves my scepticism to be unfounded though). People like this are just monstrously fit compared to your average person, they still have the same thermodynamic considerations.

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