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if the manufacturer of your car does not specify premium gas then don't waste your money. In fact, if you get your car used to premium gas, it may not run properly should you try to switch back. As a car gets older, premium gas may be your only option to help stop engine knocks, pings and rattles. The only thing that makes premium gas different is the octane level. Use regular gas!
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Here's another helpful hint: If your car does take premium, look to see whether the manufacturer "recommends" premium fuel or if it "requires" it. If it's only a recommendation (as it will be in most cases), you can safely use regular unleaded fuel; however, you may take a small hit on performance. We'll discuss the topic of performance in a little more detail later within this article. If premium unleaded fuel is a requirement, of course, you have to pay the extra money for premium fuel every time you fill up. This is because the car's engine is precisely tuned for that grade of gas.
High-octane gas isn't necessarily better than regular grade. It isn't somehow more pure and it doesn't go through a superior refining process. It doesn't even keep your engine cleaner, as some people seem to believe. Premium fuel is just gas that contains a mixture of hydrocarbons that are slightly less combustible than those found in lower octane gas. This might seem odd, since cars use internal combustion engines that rely on the combustibility of gasoline to make them go. So, why would you pay extra money for gas that doesn't ignite quite as well as less expensive gas?
The answer has to do with the way in which expensive high-performance engines, the kind that you often find in most luxury cars, are manufactured. Find out why that matters on the next page.