I've heard of racers gapping spark plugs narrower to eek out a few horsepower. But why would a wider spark plug gap increase fuel economy?
Quote:
Originally Posted by Old Tele man
...if you have FUEL ECONOMY in mind, a set of OEM iridium plugs gapped slightly wider than spec is preferred; but, if you're after POWER, a fresh set of "colder" copper-core plugs, gapped somewhat narrower than spec, is better.
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