RichMc:
It depends upon the type of riding one does. For example, my favorite type of ride is in excess of 100 miles riding over mountain passes. I like to climb in and out of the saddle. Any saving of energy over a long ride would be wlecome.
If one were to go on a 20 mile ride with rolling hills and taking it easy, you are right that the difference in inertia would not make much of a difference.
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