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Installed new NGK Iridium plugs 2 weeks ago as just a early maintenance as I now have 72,000 miles. Now this is just my impression on it, but the cars throttle response seems a little bit better nothing crazy but noticeable to me and I have seen my gas mileage go up from 27.6 MPG to 29.1 MPG and that's on 2 full tanks now. Mechanic said plugs were ok but I would need new ones soon so its good I got them before the factory recommendation of 100K miles.
 

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hangry
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104 Posts
I replaced my spark plugs over the weekend with the NGK Iridiums IZFR6K11 (OEM) and I've noticed better throttle response as well. I haven't really driven my car this weekend so I can't comment about the improved gas mileage yet. Granted, I have 120k on my TSX and its part of maintenance, it should be an inexpensive and easy way to get back some HP lost over time and get slightly better mileage.
 
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