1. Oxygen (O2) Sensor – A sluggish or faulty oxygen sensor can increase fuel consumption. When a vehicle has over 100,000 miles, a replacement should be considered. All vehicles manufactured after 1995 have an oxygen sensor mounted in the exhaust to monitor exhaust flow before and after the catalytic converter, referred to as sensor 1 and sensor 2 -- with some vehicles having as many as four. The engine computer adjusts the amount of fuel injected based on the O2 signal from sensor 1.
2. Spark Plugs – Spark plugs ignite the air/fuel mixture in the engine combustion chambers and are critical to powering your vehicle. With a fresh set of plugs, cars can run cleaner and burn fuel more efficiently. It is usually a big-ticket item at the dealership when combined with a 60,000 mile service.
3. Air Filter – A dirty air filter can reduce fuel economy, and is more problematic on older vehicles – and with the average age of vehicles on the road today at over 11 years this is something car owners should pay attention to.
4. Tires – If tires are worn out, out of alignment, or under inflated, vehicle handling and fuel efficiency will suffer.
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