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Don (not verified)    June 16, 2021 - 2:51PM

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The mileage has been declining significantly 2007 Prius. Car seemed to be running fine, just poor gas mileage. Since plugs were supposed to be good for 100k miles I didn't connect that was what the problem was. When I removed the NGK iridium plugs I could not believe how much they were worn. I'm really also surprised that the performance was not affected, just the gas mileage. I replaced with Denso iridium and now I'm getting 10 more MPG'S. Hope they are better quality and any future decline in gas mileage I will be checking my spark plugs first.

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