Generally, most cars are built to run on regular gas with an octane rating of 87. Some people believe that premium gas, with an octane rating of 91 or 92, is purer than regular grade gas and that it could add extra mileage. However, this is not exactly true. Higher octane gas ratings simply means that the fuel in your car is less likely to cause knocking or pinging – when one or more cylinders ignites due to compression. While this can be serious, it happens to a very small percentage of cars. If your car needs gas with a higher octane rating, it will say so in the manual. Otherwise, you’ll just be paying a useless 20 cents extra for every gallon.
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