![]() The reason it cannot improve gas mileage is that OBD-II cars sense both the amount of air, post filter, going into the engine and the state of combustion of the exhaust gas. All passenger cars sold in the USA since 1996 are OBD-II. They will not improve mileage on a closed loop OBD-II car. You cannot have your cake and eat it too. If you take advantage of added power by driving more aggressively, you will reduce mileage. Oh yeah, there's one more limitation imposed by science. So K&N filter technology could be an important tool, when combined with other elements, to help keep mileage as high as possible. K&N filters are less restrictive than disposable paper or synthetic air filters and K&N Intake Systems are less restrictive than the factory installed air path. There are many variables that affect mileage such as: tire inflation, the type of fuel, weather, elevation, the speed at which you drive, the gear in which you drive, the speed with which you accelerate, engine maintenance, excessive idling, cruise control, the grade of motor oil you use, and of course, the condition of your air filter. Even the EPA fuel rating numbers for new cars are often not representative of the mileage you actually experience. It is virtually impossible to make sweeping and general claims about mileage. We certainly understand why it is theoretically possible for a consumer to experience a mileage increase after installing a K&N air filter or intake system, however, we do not go so far as to make a general claim that our air filters and intake systems will provide an increase in mileage. However, these experiences do not mean you will also experience a change in your mileage. Many K&N users report an increase in their fuel economy after beginning to use our air filters, as noted on our testimonial page. Department of Transportation suggests for improving fuel economy (see ). Replacing a dirty or clogged air filter is one of many recommendations the U.S. ![]() ![]() The theory behind this is simple, the harder an engine has to work to suck air through the intake tubes and air filter, the more gas gets wasted in the process. There is a relationship between air filter restriction and mileage. If you change your air filter with a standard, but good quality paper filter regularly, there will be no added improvement in MPG.ฤก.How will a K&N filter affect my vehicle's fuel economy? ![]()
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