Pedaling downhill has a secondary usefulness. If you coast too long, your muscles can cool off. Then you'll find it hard to resume pedaling.
There's a long downgrade hereabouts. I once set out to see just how far I could coast. According to Google Earth, I coasted at least 3 miles, maybe 3.5. My legs did not like to restart! Since then I'll pedal to speed up where possible, or at least keep slowly spinning (free-wheeling).





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