There is a saying that the higher octane gasoline you feed your car, the better your car performs. I also heard that premium gasoline prolongs the life of the engine. I do not blame you if you believe this myth. I personally had believed it for years, until I conducted a detailed research. This research concluded results that were supported by information available to public by the Federal Trade Commission.
Car manufacturers spend millions maybe billions of dollars on research and development, this allows them to suggest an octane rating that would be the optimum for your car. Look in your owners manual, and the odds are that they have suggested regular octane. If you were to use higher octane than suggested , then the only advantage is that you are contributing to the ridiculous profits gas companies are making year after the other. there is absolutely no benefit of using higher than the recommended grade, your car will not perform better, will not go faster, and will not get a better fuel mileage.
If you are not sure what grade to use, then your best friend is the owners manual. It would indicate the best octane lever your car needs. However, the rule of thumb is that most cars need regular octane 87. on the other hand, for cars that are equipped with a high compression engine (sports cars, luxury cars) would need 89 or 92 to prevent knocks.A very small percentage of cars experience engine knocks when the recommended gas grade is used, this should be the only thing to use higher octane, of course if the knocking don't stop, go back to the recommended grade, and take your car to the mechanic.
Studies (reported by the Federal Trade Commission) indicated that "drivers may be spending hundreds of millions of dollars each year for higher octane gas than they need."
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