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Old 06-03-2008, 12:03 AM   #1 (permalink)
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Ryan - '94 Mazda 323 BASEEEEE
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Spark plugs

If a car suggests say AP64 and you use AP63 ones would that be a heat range lower and get better MPG or worse?

Just curious...

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Old 06-03-2008, 12:23 AM   #2 (permalink)
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Likely worse, a lower heat range plug is better if you are having engine detonation problems, I would think that the highest heat range that you can get away with would stay clean and perform best.
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Old 06-03-2008, 12:46 AM   #3 (permalink)
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yarii - '07 Toyota Yaris 4dr (auto)
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usual if your driving around like a grandma you would want a hotter plug


I am not trying to save the planet, just trying to hurt it a little less

Yaris build thread

what is... http://en.wikipedia.org/wiki/COINTELPRO
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