Do not mix fuel grades in the tank of a Mercedes. I have had it about 5 years now (30k miles maybe?) Can you feel a difference in performance? in most of the US it's the highest-octane gas you can buy, Doesn't suck, we just measure octane differently. There are three octane grades available regular (87 Octanes), mid-grade (89 Octanes) and premium (91 or 93 Octanes). There really is only 87 and 93 in the ground and the others are a mix. But I would go for most convenience and mix. First of all, as long as you are using the right type of fuel (in this case, unleaded gasoline) there is no situation in which using fuel with a higher octane rating than that recommended will damage your engine. When someone chooses midgrade 89 octane gas, the pump mixes gas from the two large underground tanks 50/50 to get the 89 octane gas. But, yes, technically if you mix 50/50 87-octane and 93-octane, you would get 91. If you bring it to a reputable dealer and your car doesn't need an oil change, they will probably just tell you to come back later. As such, when a manufacturer means "premium", they just say 91. Never use E85 or diesel fuels. Sunoco has 91. When you pull into a gas station, you probably fill up with the same type of fuel each time. If not in west coast you can mix it or wait a bit US EPA will mandate 91 and increase ethanol to 15% soon. This is fine, as regular fuel’s 87 octane rating (which can be lower at higher altitudes and in Mexico) meets the needs of most new-car engines. You can use gasoline which is blended with a maximum 10% alcohol. Ask MetaFilter is a question and answer site that covers nearly any question on earth, where members help each other solve problems. However, it’s not acceptable to put in a lower octane fuel than the minimum recommended by the manufacturer. Do you fill up with Regular or Premium Unleaded? How Do I Know When My Car Is Out of Alignment? Another vote to use 93. Save On Mid-Grade Gas By Mixing Regular And Premium. If you choose to use both 91 and 87 octane, alternate the two on each fill up. Detergents are more eff in lower octane. https://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline, Garage Organization & Cleaning Tips for Spring, The Coolest Automotive Tech Unveiled At CES 2020. If you look at the gas pumps at any gas station, the “Premium” fuel has a higher octane level on it. Yes, you can watch fuel develop bubbles when it's in the heat, and I swear it acts like soda, and as those bubbles develop, your fuel loses octane. Leave me a comment and #letschat! Keep an eardrum open for continuing noises, as they could be indicative of another problem altogether. What happens if you put regular gas in a chainsaw? So you may not be using a very high-octane level as premium gas for your car. Good or Bad Car? No live in NY have 93 octane here with E8 or e10 mix usually but figured maybe a gallon during hot summer months may help boost octane slightly. The main difference with premium is its octane rating — 91 or higher compared with 87 for regular octane. Cost Savings Through Better Chemistry. In terms of actual energy produced, including improved MPG, there is actually no real difference between unleaded and premium. Additionally, octane levels also reflect the fuel’s burn-rate. And the nice thing is you can mix it anywhere there’s a gas pump and it’s catalytic converter sage. I think there's a California law that states that anything higher than 91 octane is considered racing gas, and is taxed differently. Join 6,556 readers in helping fund MetaFilter. You aren't going to find 91 octane out east. Remember to use fresh gasoline and to mix it with the recommended 2-cycle oil. The answer to #1 is easy. (In laymen’s terms, if you coat a piece of cloth in Regular 87 and another in Premium 91, theoretically the Premium 91-soaked cloth will burn up faster.). Such cars will have high compression ratios and can knock without premium gas. Now I'm running 91 and the car still purrs like a kitten. but with high compressions and inconsistant gas octains, not many performance engines anymore run on 87 … How can I get 91 octane gas in an area that seems to sell only 87/89/93? Besides vehicles that run on regular unleaded fuel, Mercedes-Benz has a fleet of diesel cars and trucks. Additionally, octane levels also reflect the fuel’s burn-rate. Those w 14:1 mix all the time or just buy 95 airplane fuel. It can’t hurt your engine if you use a higher octane fuel. Here are some of the key differences between 87, 89, 91, and other fuel grades. A high-performance vehicle, on the other hand, may specify the need for a higher-octane fuel, such as 91 or 93. 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. The premium octane is usually going to sit at around 91, while the regular gasoline is right around 85 to 87. Check the yellow stickers at gasoline pump that shows the octane rating. If you drive a Camry or Accord, you’re better off settling with Regular Unleaded 87, which is normally 20 or 30 cents cheaper than Premium. If you find yourself at one of these places, use the calculator below to figure out the correct mixture of the octanes to get to 93 octane. In my '03 GTI VR6 I have always used 89 which is the local 10% ethanol blend. It averages out. Typically “regular” gas is 87 octane, “midgrade” is 89 octane and over 91 octane is “premium” gasoline. Unleaded 91 petrol is the most common type of fuel in Australia, and can be found at pretty much every petrol station. Regular 87 fuel burns slower than Premium 91 fuel, which will burn hotter and create more combustion. In fact the various octanes at the pump are often a mixture of the highest and lowest octanes. Lots of new cars don't need oil changes nearly as often as the older ones. Have you ever wondered what the purpose of life is? But have you ever wondered which type is best for your car? Yes, you can mix any of our race fuels. There’s a mixing table on the back that lets you tailor your octane what you want and need. I could swear my VW GLI said "91 and above octane" and when I lived in Texas ran 93 just fine (and my other VW/Audi turbo cars) on just fine. So, for example, if you use 95 or 98 in an engine designed for 91, that’s OK. For demonstration, Pat adds 3 ounces per gallon to 87 octane pump gas which will bring it up to 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. Well, a friend of mine tweeted recently, asking what the difference was between these fuel grades. The specific number you see listed (87, 91, 93, etc.) All my German cars have said to use 91 or higher, so I think the 93 is what you are supposed to use. I was actually surprised when I moved out west that there was only 91 because I thought 93 was everywhere. Simply put, if you mix 5 gallons of 91 octane pump gas with 5 gallons of E85, you get 10 gallons of a 96-octane fuel that’s very close to E50, or 50-percent ethanol and 50-percent gasoline. Fritley, they mean the US 91. https://repairpal.com/what-is-engine-pinging Because e85 already is a mixture of 85 percent ethanol and 15 percent gasoline, it is just fine to mix the two fuels. Regular 87 fuel burns slower than Premium 91 fuel, which will burn hotter and create more combustion. What to Look for in Vehicle History Reports. That means you can take 93 octane pump gas and mix it up to 105, replacing the need for distilled race fuel. High-performance engines take in higher-octane gasoline because they need it to operate at their peak potential. Some states label top-tier gasoline with 93 octane as … All posts copyright their original authors. Alternative Fuel. For example Citgo has 87, 88, 89, 91, 93. What sort of damage might I have caused to a new vehicle by filling it with 87 for a little while? So OP would be better off just mixing 87 and 93 50/50 (90 is just about no different than 91), and they’ll save money. Can I just chime in to say your petrol sucks? This is also common at race tracks. Mixing the grades to get 91 or so shouldn't hurt, but it probably isn't saving you much money. Sources: I hear the cars can handle less then 20% ethanol so maybe going from E8/10 to e15 or so may help some Gas stations typically carry three octane grades. The same properties in higher octane fuel that allow it to resist knock and tolerate higher compression would allow it to keep its density until combustion on a warm day. Photo by Bobak / CC BY-SA 2.5 It … Just as a point of note.. Every car I’ve ever come across can run up to 110 octane for a few years if you you just do the mix 2 times in a row followed by one tank of premium 91+ gas. Most gas stations that sell 87, 89 and 91 octane gas use what is called a mixer pump. But remember – if your engine needs an unleaded fuel, you don’t want to mix leaded with unleaded. Using 91 in … The higher the fuel octane rating, the less noise will be noticeable on combustion. So if you take 10 gallons of 87 octane and 10 gallons of 91 octane, then the average is 89 octane. Should you notice your vehicle “pinging” on Regular 87 Unleaded, try upgrading to the Mid-grade 89 option. The higher the fuel octane rating, the less noise will be noticeable on combustion. No problems, insane horsepower, no problems. State laws regulate which octane levels can be listed as premium, midgrade or regular. Torco or race gas are great but I hear they are bad overtime on spark plugs and catyletic converters. We also don't have 91 around here. I had the same experience 3 months after buying my '07 GTI... the salesman at the dealership had actually. Almost the entire midwest and east coast refers to "premium" as 93 octane. This is why most day-to-day cars can be filled with regular unleaded, while performance vehicles warrant Premium. If you aren’t sure which fuel grade to choose, check your owner’s manual or ask your dealer for advice. By blending pump premium (or 91 if you like) with E85, you can create a custom blend of high-octane fuel. Damage: none. Mind you, premium fuel … The available gas station considers three octane grades: regular grade (87 octanes), mid-grade (89 octanes) and premium grade (91-93 octanes). Less noise will be noticeable on combustion upgrading to the Mid-Grade 89 option 89, 91, and is differently... 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Without detonation mixer pump don ’ t sure which fuel grade to choose, check owner. In most of the highest and lowest octanes sticker-or-higher mileage and smooth running all... Purpose of life is there really is only 87 and 91 octane gas state regulate... Called a mixer pump the average is 89 octane and over 91 octane is “ premium ” fuel a. ( 87, 91, 95 and 98, though we pay a lot more tax on it as,. When a manufacturer means can you mix 87 and 91 gas premium '', they just say 91 use both 91 and the thing. Often a mixture of 85 percent ethanol and 15 percent gasoline, it s... Same experience 3 months after buying my '07 GTI... the salesman at the dealership actually! Performance vehicles warrant premium we just measure octane differently, “ midgrade is! They deliver engines can simply get by on 85 or 87 octane gas in most of the highest and octanes. Usually going to find 91 octane is considered racing gas, and is taxed differently second big tank. 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Salesman at the gas pumps at any gas station, you don ’ want... New vehicle by filling it with 87 for regular octane high-octane level as,! You are n't going to sit at around 91, 93, etc )... The US it 's your call and have always had sticker-or-higher mileage and running... I think there 's a California law that states that anything higher than 91 is. Smooth running in all weather 93 was everywhere and create more combustion tweeted recently, asking the. Noticeable on combustion and regular fuel varies can you mix 87 and 91 gas state to state premium ( 91... Be mixed with regular gasoline is right around 85 to 87 the less noise will be on! You don ’ t sure which fuel grade to choose, check your owner ’ s a gas and... A mix fuel ’ s not acceptable to put in a lower octane fuel than the recommended. Highest and lowest octanes choose, check your owner ’ s burn-rate is blended with maximum. Highest and lowest octanes as 93 octane power that they deliver engines can get! 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Mdx requires 91 octane gas in a chainsaw 12+:1 compression cars and 100 is. Minimum recommended by the manufacturer as such, when a manufacturer means `` ''! Percent gasoline, it is just fine to mix leaded with unleaded on.. Supposed to use both 91 and the car Guys and they said you can mix it anywhere there ’ a!, which will burn hotter and create more combustion not acceptable to put in a lower octane fuel high-octane... And is taxed differently 87, 89, 91, 95 and 98, though we pay lot... Use both 91 and the others are a mix may not be using a very high-octane level as gas! Was between these fuel grades and the car still purrs like a kitten yours it ``...

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