I used the HVMN ketones in addition to carbs. I didn’t change anything about my nutrition strategy for a 3hr race aside from the ketone esters.
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Breakfast 3 hr before race: 1 cup muesli, greek yogurt, banana, apple. (~1000 calories, ~100g carbs)
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Pre race: SIS caffeine gel, HVMN ketone bottle
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During race: 1.5 packs SIS Beta fuel (120g carbs) divided between two bottles. Second bottle contained the second bottle of HVMN. Can’t remember for sure, but I think i also had another SIS caffeine gel mid-race.