I've never had a serious bonk where I could at least ride 10mph or so.
My first century, I was on pace to do sub 5hr, and then at mile 90 or so I bonked. Could only ride 15mph. I was dehydrated. Luckily my riding partner gave me part of a bottle.
For me, bonking is when I crack. When I hit a hill, for example, and can't hang with the group anymore.
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