Im not convinced because of slowtwitch article. I used to have Bontrager Select wheelset that weighed close to 2000g. I upgraded to DT Swiss Mon Chasseral 1450g wheelset. Felt easier to pedal to me, for sure! So either it's more than 1%, or 1% is enough to feel.

Also, I just noticed. The chart says its for 5 seconds. Over th course of a long race that lasts an hour or hours, that 1% could add up to minutes of advantage, potentially....right?