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As I said above, it depends how deep you go and how much you 'want it'.
I couldn't walk properly after my 518mi 24hr and 3 weeks later did a 270-ish 12hr in windy conditions (other riders were ~10mi down on previous distances). When the Newbury was introduced it was before the 24hr and better conditions, as such I PBd it with a 293mi (with excess stoppage due to number pins coming out a couple of times and sticking me).sugary stuff churns my stomach
What sort of sugary stuff? Carbohydrates are your friend if you want to go fast. All the foods you list save for coke are high in fat which slow gastric emptying and likely make getting enough carbs in a problem after a time.
my clubs record for the 12hr is 271 miles which as I use a road bike is unatainable at my level. Dale sturman also has the 24hr club record at 441 miles. That is more achievable now how do I get to that level its only 18.37 mph for 24hrs. Easy in it.... actually how on a road bike I will have to eat on the go, maybe nap while riding. What can I eat on the go thats is actual food - what do folk eat for these. sugary stuff churns my stomach. last year I had to stop way to much and eat pasta, scotch eggs, sausage rolls, m&ms coffee, coke cola chocolate donuts i.e food that took time to eat. Need a better way. 7 months to find it.
I would ride a 12hrs after a 100 miler. last summer I did the 24hr then a week later a 12hr. the following wednesday i raced and got a result. sometimes you can big rides in a row (it did not last though my legs went flat in september)