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When it comes to maintaining your vehicle, popular misconceptions abound. Among the most common:
Myth: Tires should be inflated to the pressure embossed on the sidewall of the tire.
Reality: The tire-pressure figure shown on the sidewall is the maximum pressure--not the vehicle manufacturer's recommended figure. Always use the manufacturer's recommended pressure, which is determined to provide the best balance of ride, handling, and fuel economy. It's usually printed on a sticker on a doorjamb, the glovebox, or the fuel-filler door. Check your tires against the recommended pressure when your car has been at rest for a while.
Myth: If regular-grade fuel is good, premium must be better.
Reality: Most vehicles are designed to run just fine on regular-grade (87 octane) fuel. A higher octane number doesn't mean that your vehicle will perform better. It simply means that it's more resistant to engine knocking or pinging. Use the octane grade that's recommended in your vehicle's owner's manual. Filling up with a higher grade is ...