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by IsZatSo on December 2nd, 2006

IsZatSo

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Doed higher octane gasoline carry the car further per volume of gas compared to regular octane gas, because it has more power per compared volumes? Or simply put does higher octane gas give increase miles per gallon?

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Answers. 3 helpful answers below.

  • by Anonymous on December 2nd, 2006

    Anonymous

      An engine with a higher compression ratio is more efficient than one with a lower compression ratio.  However, in gasoline-type engines, a higher compression ratio makes it more prone to preignition and knocking, which greatly reduced efficiency and is bad for the engine.

      So, if you have to otherwise equal cars, and one has a higher-compression engine, that car will get better gas mileage, but you will need to burn higher-octane fuel in it.  The car with the lower-compression engine will get poorer gas mileage, but it will be happy to run on a lower-octane fuel.  The lower-compression car will not gain anything by using higher-octane fuel than it needs.

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  • by The Chief on July 9th, 2008

    The Chief

    GOOD question!

    Modern fuel injected engines with anti-knock sensors and so forth really get no added benefits of any kind by using fuel with a higher octane rating than the engine was designed to use. It's a total waste of money, as the fuel contains the same amount of energy, no matter what the octane rating is.

    The octane rating is roughly a measure of the fuel's ability to resist 'predetonation', which produces the knocking noise you may have heard from time to time, especiall on older,non-fuel injected engines. Predetonation reduces the efficiency of your engine.

    Octane ratings have absolutely NOTHING to do with how clean the gas burns, how efficient your engine runs, or how much power you produce.

    The only time high octane gas is needed is for engines which are designed to use them in order to get their full, rated horsepower output. The high compression engines, in other words.

    The absolute BEST explanation I have ever found is at this link:

    http://www.servassistonline.com/Consumers/high_octane.php

    WELL worth the reading. Especially with todays gas prices.

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  • by TheGrimReefer on May 24th, 2011

    TheGrimReefer

    One thing that people have neglected to mention is that premium fuel is often the only choice for no ethanol.

    Ethanol contains about 30% less energy per volume. So if you've mixed 10% ethanol in with your gasoline, you have 3% less energy in your tank. That's the minimum loss. For some vehicles the drop in mileage can be more dramatic.

    You will see an increase in mileage going to premium if it has no ethanol, simple because it has no ethanol, not because of octane. Above that, some cars are designed to take advantage of higher-octane fuel (or are not-designed for low octane) and you can get even more of a boost.

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