My '07 Fit reached 110k miles on the original plugs which were Denso long-life iridium so it was time for some new plugs since the gas mileage was starting to decrease. NGK Iridium is also OEM for the Fit so I decided to give these a try. It feels like a new car again, power is back and the gas mileage is up and the best part is I should be good for another 100k.