Gas Octane Ratings
A lower performance engine does not necessarily have what it takes to increase its performance using a higher octane fuel. This is because the compression ratio is determined by the engine design.
The octane number of the fuel will be measured inside of a test engine and is then defined by the comparison that exists between the mixture of iso-octane and the normal heptane. Both of these would usually have the same type of anti knocking capacity and the fuel that is being tested would.
The percentage volume of the iso-octane contained within the mixture is the octane number that is for the fuel. A good example of this is gasoline. When it has the same knocking characteristics as the mixture of 90% iso-octane and 10% heptane then it will have the octane rating of 90.
Which Octane Gas Is Better
Because of these tests many people believe that they need to be using a high octane gasoline for their car believing that it will help to improve the performance. What most do not realize is that the normal number for gasoline suggests that the majority of cars should be using regular octane fuel.
People who have tried to use a high octane fuel that was much better than the one that the manual told them to use discovered that there was no difference or improvement. It does not have the ability to make your vehicle drive better, faster, or have better gas mileage.
One of the only times that people should ever switch to the high octane fuel is if the engine begins to knock. Very few cars will require this though. You will find that switching to high octane will not have any affect on your car - but it will on your wallet. it usually costs $0.20 more than regular fuel.
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