There are many benefits of regularly changing your air filter. It will create reduced emissions, better gas mileage, increased engine life, improved acceleration, and overall improved driveability. The air filter is supposed to trap damaging debris and dirt that can damage the internal engine parts. An engine uses up to 10,000 gallons of air for each gallon of fuel burned. Air flow to the engine can be reduced from clogged air filters which will affect the emission control systems of the car. This causes spark plug ignition problems and an incorrect air-fuel mixture. The air filer should be changed every 12,000 to 15,000 miles. A clean air filter is vital to the proper operation of a vehicle.