1999 Chrysler 300 Changed Spark Plugs Air Filter More Increase Gas Mileage

1999 CHRYSLER 300
133,000 MILES
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I have changed the spark plugs and the air filter. what more can i do to increase gas mileage
Nov 13, 2012 at 10:19 AM
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DRCRANKNWRENCH
  • ✓Experienced Mechanic
  • 3,380 POSTS
Change all the oxygen sensors as they determine how much gas is sent into the engine. Old oxygenb sensors can make a car run rich and therefore not get as good a gas mileage.
Nov 13, 2012 at 10:21 AM
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