March 9, 2011
does aftermarket air filter saves gas?
i have replaced my air cleaner to an open type (mushroom type) from a stock air cleaner (the one with a black plastic box) and i havent feel any performance and gas saving. is this really work or can you suggest anything i can do to increase mileage?
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Filed under Gas Conservation FAQ by on Mar 9th, 2011. Comment. 
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Comments on does aftermarket air filter saves gas?
It does nothing for mileage. Your mileage doesn’t change because the O2 sensor tells the computer how much air is entering the engine and it computes exactly how much fuel to supply.
Good air flow to the engine helps, but not enough to measure. Keep all your tires inflated to 36 psi cold tire pressure. Use a full synthetic motor oil like http://www.mobiloil.com both in the engine and in the transmission/ differential. There are vacuum gas mileage gauges you can hook up yourself that remind you to use the accelerator pedal sparingly. Of course anticipate traffic stops to minimize the use of your brakes. Turn off the engine if your stopped longer than 2 minutes in a traffic jam etc. On long highway trips, keep the windows closed and use the external air intake and fan setting. Don’t carry around a lot of extra weight in the car. Don’t top off your fuel when your filling the tank.
http://www.jcwhitney.com/ecometer/p2022433.jcwx?filterid=j1
I make a habit of replacing the stock air filters on every vehicle with K & N (I am not a K&N salesman or affiliate) air filters. Simply stated, the K&N filters have more surface area and allow air to flow with less restriction. Improving air flow with an air filter upgrade and an exhaust upgrade are the 2 simplest ways to improve performace. Your driving habits probably have the most to do with gas mileage. Do a yahoo search for “Hypermiling” to get some quick tips on how to improve your mileage that way. I’ve also added a “PCV enhancer” and a DIY water injection “bubbler” to my 1993 4WD Geo Tracker and am averaging 28-30 mpg. (More than it was originally rated for).
Not anything noticeable. But they do save you a ton of money.
-with all my vehicles the first thing I buy is a K&N air filter. They cost roughly $40 and the cleaning solutions(if you use theirs) cost another $10-12.
When an air filter needs to be replaced every…..6,000 miles or so and cost on average $10, it doesn’t take a math genus to figure out their value.
I may get 1 mpg more and the performance in my Tundra isn’t noticeable until i hit 60-70 mph.