Most newer cars engines are efficient enough that they are already burning the majority of the available fuel. But, as time goes on, spark plugs lose much of their electrode surface area to natural erosion. When this occurs, even the best ignition systems will be strained to supply enough voltage to bridge the gap, and some fuel is left unburned. It is at this point that a spark plug change becomes necessary. When this happens, a variety of factors will determine which spark plug would be best suited for a particular application.
NGK Spark Plugs for your High Performance Vehicle