I understand this, but the engine needs the same amount of power to hold the car at 45 mph. if you need less throttle, you could still be getting the same amount of air, hence the same amount of fuel and power. Unless of course the engine is really working to pull that air in. What does an intake gain at WOT, like 5 hp? so pull it down to 20% (or something like that) of that airflow and the restriction is not as big of a deal anymore. Intake could help mileage, could hurt it. Ill believe what i believe for now until i see tests. And I run open cone and ported TB anyway.