[Christ]

We've already tried.

Unless you can come up with some data and testing to prove what you're saying, this discussion isn't going to go anywhere.

If you're cruising at 65 MPH, and it takes 14HP to keep you cruising steady-state, and you then add colder air, the ECM compensates by adding more fuel, causing you to create more power. You will begin to accelerate. You then reduce your throttle angle, which increases your engine's pumping losses, reducing it's efficiency. We're talking in simple terms, here, so we'll not even address the adiabatic benefit of warmer intake air.

What you've done by adding colder air is not increase the engine's efficiency, you've told the engine to increase the fuel volume. Making more HP at the same RPM is not a function of engine efficiency unless the fuel volume remains constant. Efficiency is a measure of HP per unit of fuel.

When you let off the throttle to compensate for additional power, you've lessened the engine's ability to breathe clearly, thus reducing the intake air charge and the amount of fuel injected, and to that extent, the HP that the engine can create per % of throttle angle. Doing so means that for each stroke, the engine is capable of drawing less air than at a larger throttle angle with the same air density, and since VE is directly linked to overall efficiency, decreasing VE means that the engine is working harder. VE is measured by determining the actual input compared to the size of the engine's "neutral size" or maximum volume at rest.

It takes a certain amount of power just to keep an engine spinning, and part of that power is overcoming vacuum, which is created by the throttle plate. The less vacuum, the less power is consumed by induction losses. To make less vacuum, you open the throttle plate more, or reduce the density of the air mass being induced. You're trying to do exactly the opposite.