Gas Mileage is dropping.

[Motzking1]

Originally Posted by tarkus

Nothing to do with misfiring. Heavily used spark plugs degrade engine performance.

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Heavily used? They haven't even reach the factory maintenance interval of a hundred twenty thousand miles? And I would like for you to explain the mechanism of action of how a used spark plug in any fashion that is working perfectly normal is going to have any adverse reaction at all on the engine. There is a federally mandated very sophisticated monitoring system to make sure if there's any issue whatsoever with the spark plugs that would cause any incomplete burn or anything all that would cause an incomplete burn in the cylinder that would eliminate a malfunction indicator lamp mil. The systems are extremely sophisticated and extremely effective. Hundreds of millions of dollars of research shared among all manufacturers has gone into designing these systems to be extremely effective. So you want me to disregard all of that and believe that you know better when to replace the spark plug?

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