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Back when I was doing lots of Audaxes I'd often get to 100km before I first ate something that day, but that was plodding along at a low intensity for those 100km.
Everybody more or less like this, that took me getting used to, makes me smile now; and on The Dean and BCM the start were not really slow.
Even fasted (i.e. work out before eating breakfast but having had a 'normal' meal the evening before) you should have enough glycogen in your blood for at least 2 hours at a hard intensity.
I rarely eat before early morning exercise (10k runs, 40k cycle rides, 5k swims, etc). Back when I was doing lots of Audaxes I'd often get to 100km before I first ate something that day, but that was plodding along at a low intensity for those 100km.