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@gbj_tester
If in doubt, do the math:
200W = 200J/s = 200x3600J/h = 720kJ/h Output power
Assume a feed conversion ratio of 0.25, you'd need to eat 2.88MJ/h
One 45g Torq gel is 478kJ, so to fuel on just gels you'd need
2880/478 = 6.0 per hour
A standard (58g) Mars bar is 1.08MJ
A medium banana is about 400-500kJ
Energy drink @ 9% carbohydrate (i.e. the strong hypertonic mix for low intensity work) is about 1.5MJ/l. Obviously the normal 6% mix is 2/3 of that.
A modest ham and cheese sandwich could be anywhere from 1 to 2 MJ, depending on how thickly you spread the butter.
In short, at the output you're targeting for the 24, you shouldn't have much trouble keeping up with your energy intake requirements as long as you stick to the old maxim of "little and often"