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fuel system - Difference between high octane and low octane? - Motor . . . So-called "octane number" is a measure of how much the air-fuel mix is resistant to detonation The higher the "octane number" is the more resistant it is and the more is can be compressed without exploding The higher the pressure is at the point the air-fuel mix ignites the more efficient the engine works Modern engines are designed for some rather high air-fuel mix pressure, if the mix
What are the benefits of premium (high octane) petrol? High octane is required for some cars: e g , a turbocharged car will likely require higher octane to reduce risk of detonation with higher charge temperatures High octane is also required to get the optimal power out of a tuned car: properly advanced timing will enhance power and economy (obviously, not at the same time)
Is high octane fuel a requirement for high-compression engines? Without specifics, and without defining "high" and "high compression" it isn't possible to determine an answer However, all other variables being held constant, using a high octane fuel allows you to design a higher compression engine to take advantage of that octane number The power then comes from the higher compression
What happens if you put the wrong kind of gas in your car? Worst case scenario is you've just wasted some money by buying the more expensive fuel If you put the lower octane fuel in an engine which specifies high octane fuel, will not cause you any major issues on an electronic fuel injected engine because it has a device known as a "knock sensor" which will pull timing
Can mixing octanes cause the check engine light to come on? A Nissan Versa (2008 or '09) driver in the USA, running on 87-octane usually, decided to fill up from almost-empty on 89-octane based on advise that it helps clean the engine They returned to high
engine theory - Will higher octane fuel improve towing power? - Motor . . . 18 According to Will higher octane fuel improve gas mileage? higher octane fuel does NOT notably improve fuel efficiency Will higher octane fuel, increase power while towing? I looked online and found two different answers Will using a higher octane fuel than required improve fuel economy or performance? It depends
turbocharger - High Octane petrols effect on turbos - Motor Vehicle . . . The owner's manual, as you suggest, will list the recommended octane for optimum performance (and mileage), and the minimum - which for Saab 9-3's is likely to be either 87 or 89 (and many Saab owners find the increased mileage from using 90+ makes it more economical than using a lower octane fuel)
turbocharger - Octane rating vs turbo boost - Motor Vehicle Maintenance . . . Gasoline with greater octane rating is used in turbocharged (as well as supercharged) applications for the simple reason to help prevent knock Because turbochargers make a bigger bang when ignition occurs, there is a higher risk of knock due to the higher pressures and higher heat created due to the boost