Mechanics

WHAT ARE THE BEST SPARK PLUGS TO USE IN A FOR MILEAGE?

2005 Mitsubishi Endeavor • 58 miles

I believe this car has denso iridium plugs When is the recommended tune up and would bosch fusion iridium give me better gas mileage and last longer? Manual claims tune up at 60k while denso plugs claim over 100k. No performance issues just ok gas mileage at about 20mpg on highway driving. Would like to get more. Claim is 22mpg on highway.
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Richard Mirandanda
October 11, 2011.



Denso is one of the brands that OEMs use quite often and are quite good. European OEMs use Denso and Bosch. 6 of one, half a dozen of the other. You could upgrade coil(s). You could change the air filter for a high flow one. Plug gap is spec'd at.029-.031 inch. You can increase it to.032-.033, which will create a hotter spark, but also put more load on the coils.

Rivermikerat
Oct 11, 2011.