I had the NGK double iridium plugs in the 96 V6 SE I had for the past year. In that time I put over 60K miles on the car (yes I drive that much in a year! Actually more!) and they proved to be rock solid the whole time. I was getting a solid 30 MPG with the car (v6 auto) on the highway which is the best I have gotten with any V6 auto Contique that I've owned. I'm don't know if that's due to the plugs or not honestly. I can tell you that I had the Bosch +4's on my turck and they only lasted about 10K miles before I started getting a misfire. Bosch is not what they used to be.
