No, not really. Any increase in mileage will be minimal at best. Far outweighed by the cost of the cold air system.
yes
yes it can
There are many reasons to add a cold air intake but performance and mileage are the two main one. However, you need to know that in application the two work against each other. Too get more performance you need more air AND more fuel so to get one you need the other. Performance intakes help with gas mileage by letting the engine breathe easier, so your mileage increases... AS LONG as you drive the same way you would. So, all things being equal you will have better mileage and better performance with a cold air intake depending on which one you are using it for at the time. Click on the link if you are looking for an intake for your Toyota 4Runner. Cheers, GPI Performance.com
A cold air intake is an aftermarket part used to help open air flow to the engine. The cold air intake sucks up cold air from underneath the car and is attached to your intake manifold. So it is a pipe going from somewhere close to the bottom of the engine compartment leading to your intake manifold.
Using a cold air intake will allow the fuel to burn more efficiently and use less. However it's not usually a noticeable difference. You may get better mileage if the car is driven conservatively.
By installing an cold air intake on a mustang
A cold air intake will increase your horse power
if you replace it, it will just sound the same if you upgrade it you will gain about 2-3HP and use more fuel meaning less mileage I HAVE A 2003 TAHOE AND I INSTALLED THE COLD AIR INTAKE AND IT GAVE IT A BETTER SOUND
Cold air intake (like a K&N) reduces intake restriction, and aftermarket exhaust will help with back pressure, and a programmer. Other mpg basic improvements like maintaining proper tire pressures and not speeding will help with fuel economy.
The main purpose of cold air intake is to increase mileage. As the engine takes in cold air instead of warm, the engine cools down and more energy can be used to run the car instead of having to use up the energy cool it.
Cold air intake is better because it's denser.
A cold air intake regulates the amount of cold air coming into a car and ensures the air is properly filtered.