Originally Posted by
asgelle
It's hard for me to understand how I'm burning fat at the same rate (mass/time) riding 6mph, 12 mph, and 18 mph.
Well, yes. But perhaps a little slack is in order. Where's that graph!? Ah, had to search for a while to find one in calories rather than percent of calories. Here 'tis:
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At least for this person, fat burn increases, what would you guess, maybe 30% between 50 and 120 watts. We don't know this rider's history, specialty, etc., so have no idea what he's trained to do.