Octane

Can I use lower octane fuel at high elevation?

Can I use lower octane fuel at high elevation?
  • 4136
  • Amos Gardner

A: Nearly all cars can run on a lower octane at high elevations. The lower octane fuel (usually regular grade) is usually 100 percent gasoline, no ethanol. It is popular in the West, especially the high plains where the air is thinner (oxygen content).

  1. Can you use lower octane fuel at higher altitudes?
  2. Does altitude affect octane?
  3. What happens if you use lower octane fuel?
  4. Can I use 86 octane instead 87?
  5. Why is there no 93 octane in Colorado?
  6. Is premium gas necessary at high altitude?
  7. Is it better to run higher octane?
  8. Why is high altitude gas lower octane?
  9. Is 85 octane the same as E85?
  10. What happens if you put 93 instead of 87?
  11. What are the benefits of high octane fuel?
  12. Can you run 87 octane on a 93 octane tune?

Can you use lower octane fuel at higher altitudes?

The lower the octane level in gasoline, the less expensive it is for refiners to produce. ... Research several years ago from the American Petroleum Institute showed that lower air pressure at higher altitudes allows vehicles to perform as well with 85 octane as they would with 87 at lower altitudes.

Does altitude affect octane?

A: At higher altitudes, the air is thinner so you can actually get by with a lower octane gasoline. For instance, regular grade fuel is 87 octane in Chicago, but 85 octane in Denver. Your car will adjust itself for any elevation.

What happens if you use lower octane fuel?

If the octane rating is less than 91, you could damage the engine and may void your vehicle warranty. ... They usually warn that using lower-octane gas could reduce performance and fuel economy. When that happens noticeably, or if engine knock occurs, they advise to start using premium.

Can I use 86 octane instead 87?

Consult your owner's manual before fueling." Automakers would prefer a total ban on 85 and 86 octane gasoline. Less than 2% of the vehicles in the U.S. have carburetors, according to GM. ... "My Scion iQ clearly stated that no gasoline lower than 87 octane should be used because it could damage the engine," Gutzler said.

Why is there no 93 octane in Colorado?

The reason why is that at high altitude, you are not getting enough air to warrant getting higher octane fuel. It won't do any more or less if you use 93 octane or 100 octane because the engine won't compress the cylinders enough to start dieseling due to the lower pressure of the air.

Is premium gas necessary at high altitude?

At higher altitudes, the thinner air compensates for the gasoline's lower octane, so the engine can usually run without detonation. If you are staying in the area, you can generally use the same level of gasoline you would at lower altitudes, i.e. regular, mid-grade or premium.

Is it better to run higher octane?

Unless your engine is knocking, buying higher octane gasoline is a waste of money. ... In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage, or run cleaner.

Why is high altitude gas lower octane?

Octane Ratings At Altitude

Because the air is less dense, less air flows to your car's engine. This translates to a slightly richer air-fuel ratio, and deters engine knock. ... In most cases, you won't experience any problems running 85 octane in an ordinary car when a few thousand feet above sea level.

Is 85 octane the same as E85?

No, 85 octane is a relatively low octane, most regular grade gasolines start at 87 octane. E85 is a different number, That specified the percentage of ethanol in the gas but does not tell anything about octane, which must also be specified on the pump. 85% ethanol is high.

What happens if you put 93 instead of 87?

If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don't worry. You're actually filling your car or truck with a different blend of gas, which means it will burn differently in your engine.

What are the benefits of high octane fuel?

In these cases, a higher octane fuel helps resist engine knock and allows the engine to operate closer to its normal conditions rather than detuning to prevent engine knock. For best performance, use the fuel recommended in your vehicle owner's manual.

Can you run 87 octane on a 93 octane tune?

87 is the standard octane rating that most car engines are designed for. ... The reason why you should never run a lower octane fuel on a vehicle tuned for higher octane fuel is because the tune has no way of detecting what fuel you are using and will continue to operate assuming you put in the correct fuel.

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