VO2Max Sets: It's about strength, not a higher #

From BrianMac

VO2max on its own is a poor predictor of performance but using the velocity (vVO2max) and duration (tlimvVO2max) that an athlete can operate at their VO2max will provide a better indication of performance. vVO2max is the minimal running velocity which produces VO2Max i.e. causes your muscular system to utilise oxygen at its highest possible rate.

Running at vVO2max increases leg muscle strength and power, and enhanced strength tends to improve economy (muscle cells are stronger, fewer needed to run at a particular pace, thus the energy expenditure is lower). vVO2max effort boosts neuromuscular responsiveness and coordination which reduces energy expenditure.