GAS MILEAGE

  • Tiny
  • phurt
  • 2001 Nissan Maxima

Will regular gas lessen the gas mileage of a car that requires mid-grade or higher?

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Thursday, July 28th, 2011 AT 5:05 PM

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  • Tiny
  • caradiodoc
  • Expert
  • 25,629 posts

Possibly. Higher octane fuel does not produce more power or fuel mileage. It allows engines to be TUNED for more power. That usually means a higher compression ratio which can result in spark knock. Higher octane fuel is harder to ignite so spark knock is reduced. A lower octane fuel might cause spark knock which will be detected by a knock sensor, (if your engine uses one). The Engine Computer will respond by retarding ignition timing which reduces power and fuel mileage.

Using a higher octane fuel in an engine that is designed for 87 octane will not gain anything by way of power or fuel mileage.

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Thursday, July 28th, 2011 AT 5:26 PM

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