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Replace spark plugs early and save a lot
If your 100,000-mile spark plugs have 80,000 miles on
them, they’re 80 percent worn. Misfires and incomplete
combustion occur more frequently during that last
20,000 miles, costing you almost $562.50 in
wasted fuel. You have to replace your spark plugs
anyway, so do it early and pocket the savings.
Even if you have to replace the plugs one
extra time over the life of your car, you’ll
still come out way ahead. And don't automatically assume your plugs are good for 100,000 miles. Many four-cylinder engines require new spark plugs at either 30,000- or 60,000-mile intervals.