Originally Posted by ZHVelo

Sorry but what are you talking about? If I want to ride 200 watts, I ride 200 watts. On a faster, lighter bike I just travel longer than on a slower heavier bike. But my average watts will be 200 in both cases. "Amount of energy" really is about of power you put out and that is entirely independent of the bike.

I recently had this moronic instagram influencer tell people to train on a gravel bike for the same reason you are suggesting.