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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Premium Gas | 105Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Premium gas is not a waste of money depending on what your engine takes. People are misunderstanding the word "premium" for gas. There are three tiers of gas: regular, mid-grade, and premium. It has nothing to do with the QUALITY of the gas. It's all about the octane rating. Regular is 87 octane, mid-grade is 89 octane, and premium is 91/93 octane depending on where you live. If your engine knocks like crazy with 87 octane, then try a higher octane. After all, octane rating is the measurement of gasoline's anti-knock index. The higher the octane, the more resistant the gasoline is to knock (compression and heat before igniting). You can't put whatever octane you feel like. You can't say "Oh I feel like pumping regular gas today" when your engine requires 91/93 octane. Now if your engine requires a MINIMUM of 87 octane, then yes, using a higher octane will be a waste of a few dollars. Sometimes it provides a noticeable difference, and sometimes it doesn't. Newer engines are being programmed to use different octane rated gasolines. For example, Mazda's new turbocharged engine can use 87 octane without any knock but at the cost of power loss, but you can opt to use 91 octane to utilize the engine's maximum horsepower output. I always hear this "premium gas is a waste of money" phrase, and it just makes no sense if you know a thing or two about gasoline and octane. | |||||
| Answer to: Distance to empty on Ford Escape 2014 | 86Relevance | 4 years ago | Benjilafouine | Submit Your Question HERE | |
| I’ll forget your last comment. I’ve been driving my very same Focus 2003 since 19 years. Bought it new. I know it inside out. I’ve been testing for three months with different levels of octane under all kinds of circumstances (Focus and Escape). I considered weather, humidity, rain, level of gasoline in the tank, etc. It is always possible that I purchased octane 94 gas that was not as advertised (although I only buy from the best outlets). Battery is new BTW from May. I am also checking it from time to time with a trickle charger to see if it’s fully charged or not. For the mixture, especially for the 94 octane, I made very sure that my Focus tank was empty: I even brought with me a gallon of gas in a can in case I would run out of gas because the tank was at a critical level. This is not a 100% scientific rigorous test but it has some intelligence behind it. And why would I weight my vehicle? Because I drank a soda can before leaving? I was expecting octane 94 to give a bit more kick on the Focus, but no. Actually, I noticed that on the same stretches of the road that I’ve been driving daily since April, octane 94 did not seem to improve on octane 91 and even being incapable of sustaining the speed of the car with octane 91, but not by much. My conclusion is that filling the Focus with octane 94 did not provided a few extra horsepowers. However, the difference between octane 87 and 91 was very clear throughout summer. Also, I have not checked on the Focus if the mileage increased from higher octane 94 but on the Escape, it definitely did. Because of that testing, I’ll continue to fill up with octane 91 on both cars because the closest outlet with 94 is at one hour drive from my house. However, I’m curious as to why octane 94 did not improved on octane 91. | |||||
| Octane 88 not good for octane 87 engines? | 58Relevance | 2 years ago | Kaizen | Submit Your Question HERE | |
| This article is suggesting that 88-octane is not good for 87-octane engines. I was of the understanding that you can always go higher octane, without ill effects, but you can’t go lower octane, because of potential knocking. The article also states that the 88-octane oil is 15% ethanol. So maybe it is the ethanol rating and not the octane rating that is problematic? | |||||
| Answer to: High octane gas probably did some damage to my car | 55Relevance | 5 years ago | spijet | Submit Your Question HERE | |
| Hello fellow Russian! 🙂 I'm not sure that this problem could be caused by a high-octane gas. If anything, higher octane reduces the risk of premature detonation and generally has a lower burning temperature (or so I heard), reducing the risk of blowing your engine's head off. Most likely it's been caused by some problem in your cooling system. Also, since you have squeaking noises, check if your engine gets enough lubrication (i.e. you're not low on oil and use the proper viscosity). To all Americans wondering about weird octane nubmers the OP is referring to: unlike AKI in the US, we use Research octane Number (RON) to measure gasoline octane number in Russia. Common gas types available here are 92, 95, 98 and sometimes 100 RON (83-87, 90-91, 93-94 and 94-100 AKI accordingly), with 92 and 95 RON being the most popular. Lada engines are still largely based on the old USSR-era designs and were originally supposed to run on lower octane gas, so people are wary of using higher-octane fuel in these. | |||||
| Answer to: Octane Booster Question | 42Relevance | 4 years ago | AutoDIY | Submit Your Question HERE | |
| Check out the race-gas.com calculator: Race gas original 87 base octane - desired octane 91 2 ounces of race gas added per gallon of 87 octane = boosts octane to 91 Race Gas concentrate 32oz price: $32.49 (plus your state tax rate?) = Approximately $1.02+ an ounce 20 gallons of 87 octane + 40 ounces of race gas = Not worth the price | |||||
| Answer to: Gasoline Octane Question and Question About Acura Ownership | 42Relevance | 5 years ago | Whatchamacallit | Submit Your Question HERE | |
| If you use lower octane you will have reduced engine performance as well as engine knock. On Page 29 of your owner’s manual tells you what happens if you use lower octane than 91 (which is recommended by them): “Use of a lower octane gasoline [87 or lower] can cause occasional metallic knocking noise and will result in decreased engine performance. Use of a gasoline with a pump octane less than 87 can lead to engine damage.” The engine in that particular vehicle was tuned to work optimally on 91+ octane, so I would stick to that for longevity. | |||||
| Answer to: Gas type | 40Relevance | 5 years ago | Kaizen | Submit Your Question HERE | |
| Use the required gas by the manufacturer. You'll get the best performance out of the car. Lower octane gas will increase the likelihood of engine knock in cars that require higher octane gas. Knock is when the gas combusts prematurely, and lower octane gas tends to combust prematurely versus higher octane gas. Modern cars have sensors which will adjust the engine to reduce knock, but you lose performance of your engine. But using lower octane in your case may even run horribly and potentially damage the engine. Unless absolutely necessary, use the recommended octane from the manufacturer. | |||||
| Answer to: lexus premium fuel - is it really needed | 53Relevance | 2 years ago | AutoDIY | Submit Your Question HERE | |
| Out of curiosity, I googled the manual for your vehicle: "You must only use unleaded gasoline in your vehicle. Select premium unleaded gasoline with an octane rating of 91 (Research octane Number 96) or higher required for optimum engine performance. If 91 octane cannot be obtained, you may use unleaded gasoline with an octane rating as low as 87 (Research octane Number 91). Use of unleaded gasoline with an octane rating lower than 91 may result in engine knocking and significantly reduced performance. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline." Based on what the manual is saying, I would only use premium. It looks like Lexus did not design the engine computer to retard the timing when a lower octane fuel is being used. | |||||
| Answer to: 2015 lexus gas | 53Relevance | 4 years ago | Glen_stet | Submit Your Question HERE | |
| Here's what Lexus says: "Premium unleaded gasoline with an octane rating of 91 (Research octaneNumber 96) or higher required for optimum engine performance. If 91octane cannot be obtained, you may use unleaded gasoline with an octanerating as low as 87 (Research octane Number 91). Use of unleaded gaso-line with an octane rating lower than 91 may result in engine knocking andsignificantly reduced performance. Persistent knocking can lead to enginedamage and should be corrected by refueling with higher octane unleadedgasoline" Page 571 your owner's manual, downloadable from So, 91 octane OK, 87 will work, but not recommended. | |||||
| Answer to: DIG vs Turbo | 53Relevance | 5 years ago | Kaizen | Submit Your Question HERE | |
| Gasoline Direct Injection, Turbo, and octane are all independent of each other. And they can also all be used together. Gasoline Direct Injection means gas is injected directly into the cylinder head, instead of the intake chamber where it normally is injected. Turbo means getting more air into the engine. A turbo does this by using exhaust gasses to turn the turbo, thus getting more air into the intake. octane refers to the gasoline ability to prevent engine knock when ignited. The higher the octane number, the more compression the fuel can withstand before detonating. The lower the octane number, the lower the compression the fuel can withstand before detonating. Use the gas the manufacturer recommends. Some cars require higher octane, many cars don't need higher octane. It doesn't matter whether it is GDI or Turbo. Some use lower octane, some use higher octane. In most circumstances, use the gas the manufacturer recommends. | |||||
| Answer to: Gasoline | 53Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Here is a great explanation on fuel octane:"The problem is that the popular components used to make the octane of a fuel higher slows the burn rate and a fuel with a burn rate that is too slow can result in an engine power loss. Of course, that is just typically what happens and it does not hold true for all fuels. In part 2, we will explore all of the alternative fuels, how they affect your engine’s performance and reliability, and which fuel is right for you." But guess what...regularly available 91/93 octane fuel at gas stations burn slower because we use ethanol blends as an octane booster (at least here in the US), and ethanol in general burns slower and more completely. But of course this varies by what additives are used as the octane booster. Gasoline is gasoline, it always has the same octane rating until we use additives to increase the octane. | |||||
| Answer to: 85 octane fuel? | 49Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| That may be a true claim as to why they are selling 85. The higher the altitude, the air is less dense and therefore less oxygen in a given volume. The octane rating (gasoline's resistance to auto-ignition in higher pressures) coincides with the amount of oxygen your engine consumes. Turbocharged and supercharged engines use a minimum of 91/93 because more air is forced into the cylinder (more pressure). The more air you get in the cylinder, the higher the compression. You need a higher octane gas for higher compression to prevent knocking (prevent the gas from pre-igniting due to the high compression). And conversely, you use a lower octane gas for lower compressions. But here is the thing, you can use higher octane gas for lower compression (may or may not feel a difference), but you CANNOT use low octane for higher compression. In your situation, you're getting a lower compression than normal because of the altitude you are at (less air pressure), so you can use a lower octane rating like 85 without the risk of engine knock. You can try out 85 and see if there is a difference. If there isn't a difference then just use 85 since it's the low-grade there and cheaper. Fun fact: your engine actually produces less horsepower at higher altitude because of this. Engines produce the most power at sea level. This was highly researched during WWI and WWII because of the introduction of aircrafts. | |||||
| Using 85 Octane gasoline | 36Relevance | 3 years ago | JPPlatt | Submit Your Question HERE | |
| I live in Colorado and our pumps have 3 grades 85, 87, and 91 octane gasoline. I have a new Toyota 4.0 liter engine. The manual says use 87 octane and the dealer recommended 87 octane. My understanding is at high altitude (5000 feet) 85 octane is ok. What does Scotty recommend? | |||||
| 85 Octane | 36Relevance | 5 years ago | Fireman_311 | Submit Your Question HERE | |
| Hi Scotty and others, I live in Utah and our base octane gasoline is 85 octane. Why is this? What is the advantage or disadvantage? Most vehicles recommend 87 octane, is there anything that would cause this octane to harm a vehicle? Thanks for your attention. | |||||
| Answer to: Hi Scotty I have a question to ask you please I have GMC Sierra 1500 Denali 2017 with engine 6.2 l my question is if use octane booster that add 4 extra octane and I’m already using 93 octane gas will damage the engine? | 34Relevance | 5 years ago | USAFdozerpilot | Submit Your Question HERE | |
| Is there a reason that you feel you need an extra 4 octane? | |||||
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