Quick Answer: How Do I Know What Octane I Need?

How do I know if I need premium gas?

Many cars will have a sticker inside the fuel door that tells you if it recommends or requires premium gas.

You can always check your owner’s manual..

Do any cars require premium gas?

In many cases, the answer is probably no — you’ll likely be able to use regular fuel with no noticeable issues except for minor losses in performance and gas mileage. If your owner’s manual says that premium fuel is required, then you should do it, but your car won’t blow up if you occasionally opt for regular.

Is premium gas really worth it?

Typically, high-performance cars require premium, because their engines have higher compression ratios, while other cars can run just fine on lower octane gas. … The FTC sums it up this way: “In most cases, using a higher octane gasoline than your owner’s manual recommends offers absolutely no benefit.”

Which gas is better 87 89 or 93?

Regular gas is rated at 87 octane in most states, while premium gas is often rated higher at 91 or 93. Fuel with a higher octane rating can stand up to higher compression before it detonates. Essentially, the higher the octane rating, the lower the likelihood that detonation happens at the wrong time.

Will 100 octane hurt my car?

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.

What compression is best for 93 octane?

If the cylinders are sealing up well, I look for 190 psi as a lower limit with preferably 200 psi as a target when using 93-octane fuel. For every octane number less than 93, the compression pressure needs to be about 5 psi less to avoid detonation under normal circumstances.

What happens if I use 87 octane instead of 89?

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.

Do luxury cars need premium gas?

Luxury Cars require premium gas to function at higher fuel efficiency and to maximize their speed and performance. While you could use regular gas in a luxury car, using it long term will cause your engine to experience extra wear and could potentially void your warranty.

Does 93 octane have ethanol in it?

According to Dan McTeague, a noted petroleum analyst, Shell and Esso 91 are both ethanol free. … The octane rating of pure ethanol is 100, but when it’s blended with gasoline, it performs as if it’s 112. In other words, higher-octane blends — Petro Canada’s 94 and Esso’s 93 — use more ethanol, not less.

What octane is jet fuel?

The octane ratings of AVGAS, a gasoline-based fuel, are usually either 91 or 100 (lean mixture) and 96 or 130 (rich mixture). The octane rating of jet fuel is much lower, around 15 – this is much more like automotive diesel and thus much more resistant to detonating due to sparks or compression.

What happens if you accidentally put regular gas instead of premium?

If you mistakenly fill up with regular fuel, your car’s ECU will adjust engine timing and performance to work with the lower-octane fuel. In most cases, this is ok for the times when there are no premium pumps around, but it’s not ideal to run the cheapest fuel possible for extended periods of time.

Can you have too much octane?

If you run too much octane in your engine it won’t run very well because the burn is way too slow. … If the octane is too low, the fuel will burn too fast and too hot which causes detonation and leads to sure-fire engine damage.

What number is premium gas?

Gas stations in the United States generally offer three octane grades: regular (usually 87 octane), mid-grade (usually 89 octane), and premium (usually 91 or 93).

Can I mix regular and premium gas?

It probably won’t hurt anything. If your car requires regular gas, the blend will have plenty of octane and detergent and may even run a little better or get a bit better mileage. … If your car needs only the lower octane gasoline to run well, you won’t see any advantage in the slightly higher octane of the mixed fuel.

Does premium gas give better mileage?

Premium gas gives you more miles per gallon than regular gas. … In actual fact, you’ll get a greater range of fuel economy between different brands of regular gas, than you will between the same manufacturer’s regular and premium gasses.

Does putting premium gas make a difference?

Premium-grade gasoline is the most expensive gas you can usually buy, costing about 50 cents a gallon more than regular. Because only about 18 percent of new cars sold in the United States need it, there is no advantage in performance, fuel economy or emissions control for the other 82 percent to use high octane.

What octane is needed for 11 1 compression?

95 Octane. Gasoline with this octane number is known in Indonesia under the brands Pertamax Plus (produced by Pertamina), Super Extra (produced by Shell), and Primax (produced by Petronas). This type of gasoline is advisable for car engines with compression ratios of 11:1 to 12:1.

How do I know what octane rating my gas is?

The octane rating of gasoline is measured in a test engine and is defined by comparison with the mixture of 2,2,4-trimethylpentane (iso-octane) and heptane that would have the same anti-knocking capacity as the fuel under test: the percentage, by volume, of 2,2,4-trimethylpentane in that mixture is the octane number of …

What happens if you put 87 instead of 93?

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 premium gas last longer?

Sadly, there’s nothing in premium gasoline that would make it last longer than other fuels from the pump. Since the distinguishing feature is the higher-octane levels, the only real benefit you gain is lowering the chance of engine knocking, which isn’t much of a threat on most modern fuel systems.

Does 87 octane damage engine?

“Use premium unleaded gasoline with a posted octane rating of 91 or higher. 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.