From Eric Peters Autos:
Everyone's jumping on the "how to save gas" bandwagon – understandably. It's on everyone's mind. But that doesn't mean you ought to believe everything you read.
For instance, there's the bogus:
* Regular tune-ups will save you gas -
Most late model cars (that's anything built over about the past 10 years or so) generally don't need regular tune-ups. Spark plugs last as long as 100,000 miles, ignition systems are largely maintenance-free, and the car's onboard computer automatically adjusts things like the air-fuel ratio and ignition timing to optimize performance and economy.
Unless the "check engine" light comes on or you notice a change in the way the engine sounds/performs (or your mileage suddenly decreases), you should not worry about tune-ups until the time/mileage interval specified in your vehicle owner's manual.
Until then, just change the oil and air filter (when needed) and keep the tires inflated. That's usually all you need to worry about.
* Warm up your car before you...
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