Quick Answer: How Do I Know What Octane To Use?

What is the minimum octane rating?

87Regular (the lowest octane fuel–generally 87) Midgrade (the middle range octane fuel–generally 89–90) Premium (the highest octane fuel–generally 91–94).

What happens if you put 93 octane in a 87 octane car?

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 may feel a difference in the way the vehicle runs and may notice an improvement in gas mileage, but that’s about all that will happen.

Does the brand of gas really matter?

Yes, it does matter, because some brands contain more detergent additives that can prevent carbon deposits from forming inside your engine. These are the so-called Top Tier brands that use considerably more detergent and/or additives than is required by the EPA.

Do cars really need premium gas?

Some manufacturers recommend premium gas but say that regular or mid-grade gas can be used instead. 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.

What happens if you mix 87 and 89 gas?

Using a higher octane than necessary If you opt for a higher octane than your manual recommends—say, 89 instead of 87—your car will be perfectly fine, an article on AAMCO’s blog explains. It will not, however, improve your car’s mileage or give it any sort of extra performance boost, according to Car Talk.

How do I know what octane I need?

How to identify what octane your car needs: First, open the fuel filler door. Next, look at the gas cap and the inside of the fuel filler door. One of these should have the recommended octane fuel for the vehicle written on it.

Does it matter what octane gas I use?

In a consumer notice, the Federal Trade Commission, notes: “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.”

What does octane rating mean?

Octane rating is a measure of a fuel’s ability to resist ‘knock. ‘ The octane requirement of an engine varies with compression ratio, geometrical and mechanical considerations, and operating conditions. The higher the octane number, the greater the fuel’s resistance to knocking or pinging during combustion.

What octane is needed for 11 1 compression?

The convention motor absolutely needs 93 octane and you better be gentle with the advance curve. Both motors get great gas mileage due to the high compression and small duration cam.

Will 110 octane hurt my car?

EZ- Your engine is not set up to take advantage of 110 octane fuel, but it will definitely not cause your car to overheat. The higher the octane you use, up to a certain limit, the more resistant the fuel is to preignition/detonation/knocking, allowing an engine to run more ignition advance.

Is 100 octane fuel safe?

High octane race fuel is sort of the same way. Nitro won’t even burn unless it’s compressed. You can literally put a match out in it, but under compression, it’s a whole other story! … If you have 10:1 – 11:1, you can run up to about 100 octane and be fine, but if you have in the 9:1 area, don’t even bother.

Can higher octane hurt your engine?

The higher the octane, the greater its ability to prevent the unruly type of combustion engineers call detonation. The goal is to ignite the fuel mixture solely with the spark plug, rather than from the heat in the cylinder, to prevent detonation, which can seriously damage high-performance engines.