Average Reviews:
(More customer reviews)This has the 0.4mm tip which Denso says to replace in 30,000 miles. I replaced the distributor cap, rotor and the plugs as I do each 10,000 miles. When I purchased them I assumed they would last 120,000 miles, but the ones that last that long have the 0.7mm tip. My 1994 4 cyl Toyota pickup runs better and idles more smoothly.
For the last 21 tanks of gas the average gas mileage was 19.819. With the Iridium plugs the mileage was 21.045. I normally use 89 octane on the next tank I will try 87 because I read the iridium reacts with the benzine for a better burn.
Based on the improvement above I would use 88.188 less gallons of gas over a 30,000 mile period which would save $238.11 based on gas at $2.70 a gallon.
The newer cars (my 2003 Corolla is an example) came with iridium plugs so I would think only the older cars would benefit from this upgrade.
I used Amsoil Performance Improver, the tank that ran the PI got 20.3 mpg, the last time I ran a tank of PI I got 17.5 mpg with regular Toyota plugs. I continue to get about 1.1 mpg better with these plugs.
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