E3 Spark Plugs E3.12 Small Engine and Lawn & Garden Spark Plug , Pack of 1 Garden, Lawn, Supply, Maintenance Near elimination of performance inhibiting carbon deposits, dramatically longer plug life and limite DiamondFire electrode technology that creates a superior spark and resulting flame front extending f Significant potential power increase: &gt; 6% to 12% (depending on engine class) Significant potential fuel efficiency improvement: &gt; 4% to 13% (depending on engine class) Drastic potential emissions reduction when used in 2 and 4-stroke engines (after 50 hours): 58% CO e