Yea no, you misunderstood what was being described driving at normal highway speeds is a low load in his examples.
It’s more accurate to say these engines are more efficient under normal driving conditions, but have the option to be driven at high acceleration or extreme speed. Anyone can get poor gas mileage in a Prius if they drive like a race car driver, nobody has the option to drive a big V6 efficiently.
Aka Nobody publishes cannonball run fuel efficiency because that’s abnormal conditions.
It’s more accurate to say these engines are more efficient under normal driving conditions, but have the option to be driven at high acceleration or extreme speed. Anyone can get poor gas mileage in a Prius if they drive like a race car driver, nobody has the option to drive a big V6 efficiently.
Aka Nobody publishes cannonball run fuel efficiency because that’s abnormal conditions.