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Driving habits will affect your gas mileage the most..
If your engine is running smoothly and no CEL being thrown.. then your plugs are most likely fine..
You might try a different brand of gas... This can affect mileage quite a bit.. especially if the percentage of ethanol is higher.. which varies among batches.
The oil companies also change the mixtures when the season change for warmer weather and mileage tends to drop some..
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