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Old 11-11-2012, 12:47 AM   #7 (permalink)
AaronMartinSole
Your car looks ridiculous
 
Join Date: Jul 2012
Location: Northern California
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The Fantastic Festiva - '90 Ford Festiva L
90 day: 43.16 mpg (US)

A Civic Duty - '96 Honda Civic LX
90 day: 34.9 mpg (US)

Ranger Danger - '96 Ford Ranger XL
90 day: 17.42 mpg (US)
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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 View Post
...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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