Review on Autolite XP5224 Iridium Spark Plug by Rick Bishop

I install it in the Chevrolet Aveo and Suzuki Forenza (both cars use the same spark plugs). In order for them to work, you need to get the gap in them right (just like any other single ground electrode spark plug). Boxing 1.- Noticeable improvement on take off - quick, no hesitation 2.- Increased power - At 8,000ft it's easy to notice an improvement in torque and it was noticeable. I wasn't expecting an improvement in fuel economy per gallon, so I didn't bother. It hasn't gone bad, my wallet says the MPG is no better, but the engine response is worth the change. For your information. The original Aveo plugs ran 3500 miles, the original Forenza plugs ran 20000. They were new for convenience.