Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: It fit, but after one year of use they fouled in my 2001 Prius
Review: A mechanic installed Autolite XP3924 Xtreme Performance Iridium Spark Plugs in my 2001 Toyota Prius, replacing the original Toyota spark plugs with 122,400 miles, thinking they were correct. After one year of use and 6,000 miles, the MPG had deteriorated from 46 MPG to 39 MPG average. When the Check Engine warning lite appeared, I took it to a Toyota dealer for service. They found cylinders three and one misfiring. Dealer replaced plugs with Toyota spark plugs and cleaned MAF. MPG is back to 46 MPG average. The cost of plugs from the mechanic was $11.95 each. The cost of plugs from the Toyota dealer was $10.37 each. Would not recommend these spark plugs in Toyota Prius.
