I have proven this myself with many vehicles that I have owned and modified myself. Given that, if the air going by the throttle place is more oxygen rich, the fuel will be burned more efficiently.When an engine runs more efficiently, it uses less fuel to create the same amount of power. When air is colder, the oxygen content is richer. Increasing horsepower at WOT is a whole different ballgame and not related to fuel economy.ДЄ cold air intake not only lets more air into the intake, the air is more dense. The only way you can increase your gas mileage with a computer controlling your vehicle's gas injection is by changing your driving habits or increasing the inherent efficiency of the engine by decreasing friction, changing gear ratios etc. So, no matter what intake you have, you will still burn the same amount of fuel per mile to keep your engine at 50 mph. If the air is colder, you will just have a smaller throttle opening, but the amount of oxygen will still be the same, and so will the amount of gas injected to burn that oxygen. No matter how much air is available from some intake, your throttle is what limits what gets in to your engine. It only depends on how much air your throttle lets in - therefore, how much gas is metered by the ECM. You need a specific amount of gas to drive your vehicle at 50 mph and it is independent of the air intake properties. If you want to drive 50 mph, then you adjust your throttle opening to give you that. No matter how much air or how cold the air, the limiting factor in your intake is the throttle plate. The part I don't buy into is any increase in gas mileage which is the whole deal for 99% of the time driving.

The more air and fuel you consume, the more horsepower you generate. That's a given by the nature of the beast. If you can intake more air or colder air (same thing) then you will be able to make more horsepower at WOT.

I don't agree with these supposed benefits of a CAI.

Air doc intakes