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Re: Cold Air box save MPG?
CAI is not going to increase your gas mileage. The whole point of CAI is increased horse power.
Normal driving you probably wont know a difference but the CAI system is intended to get colder denser air into the cylinders and the computer is going to attempt to maintain that 16:1 Air/Fuel ratio. In other words it will be adding more gas! You can make the argument of more power means less gas required but that just doesn't fit the physics.
The only way to increase your gas mileage is to burn less of it. There are very few ways to do that. You can make the engine more efficient by removing as much drag/friction on the internal parts as possible. That means things like roller cams, reduce mechanical fans or pulleys (electric fan, water pump and loose the AC), synthetic oils (much higher anti-friction coefficient), keep the engine at optimum temperature - not to hot - not to cold.
The only other thing you can do is use a smaller engine or do something like adding hydrogen, natural gas or propane to the mixture.
Keep in mind all of the so called gas saving gimmicks are exactly that - gimmicks.
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