Oskar Svendsen recorded the highest ever value in a VO2 max test at age 18 where he went on to win the world junior championship. However, he retired before he turned 21 after a failed attempt at a pro career. The Swedish School of Sport and Health Sciences conducted a study on how Svendsen wasn’t the fasted despite having the best aerobic abilities. They found that while he had a Ferrari engine, he guzzled fuel wastefully with horrible gas mileage. Previous data pulled from other athletes showed that “high VO2 max values are incompatible with excellent running economy.”
Source: https://www.outsideonline.com/2407295/why-higher-vo2max-isnt-always-better