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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: 2011 Lexus rx350 premium gas?? | 46Relevance | 3 years ago | Hixster | Submit Your Question HERE | |
| First, I was wrong and I apologize. Secondly, your gas cap may say "Premium Fuel Required" but that's also incorrect. From the 2011 Lexus RX350 handbook page 606: "Your vehicle must use only unleaded gasoline. 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. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline." Save your money - use regular gas. | |||||
| Answer to: Distance to empty on Ford Escape 2014 | 46Relevance | 4 years ago | Benjilafouine | Submit Your Question HERE | |
| Well, this is strange. Yesterday, I filled my Focus 2003 with octane 91 (from octane 94 last week). Driving through my usual mountain ridge today, I felt that the Focus had more power with octane 91 than 94. I was already not impressed with octane 94 last week. There is a particular hill on my route that I use for testing. Simple enough: I downshift in fourth speed and set the cruise control to 100 km/h. With octane 87, it could not hold its speed by 7-8 kilometres. With the 91, it would lose only 1-2 kilometres and with octane 94, I noticed 4-5 kilometres. If I interpret this correctly, the advanced timing could not cope with octane 94? How can this be explained? | |||||
| Answer to: Distance to empty on Ford Escape 2014 | 46Relevance | 4 years ago | Justin Shepherd | Submit Your Question HERE | |
| A 2003 Ford Focus is likely new enough to detect octane ranges. The technology in computer controlled cars started coming out in the late 90s with Flex-Fuel vehicle introduction (my 1999 Ranger is a flex fuel vehicle and it detects the octane change). My 1994 BMW also detected octane changes. Owner's manual said to use premium gas for best performance. You would need to go back to the late 70s and up through probably the early 90s to genuinely find a car that can't detect octane changes. For example, my '79 Catalina is carbureted, it doesn't "know" the octane, it just mechanically meters whatever liquid is in it to go in the engine. Putting high octane gas in when the engine is designed for regular is just wasting money (my compression ratio is 8.5:1, a modern car like that Focus is more like 9:0-9.5:1 or higher) | |||||
| Answer to: Gasoline | 46Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Yeah, usually non-performance oriented street cars don't have very high compression ratios. I'm assuming that's more of a cost thing because you need stronger piston heads and engine blocks to withstand higher compression. Air volume is equally important as well when determining octane. For example, a 2019 Mazda3 has a compression ratio of 13:1 (naturally aspirated) which uses 87 octane minimum, and my 2016 BMW has a compression ratio of 10:1 (turbocharged) which uses 91 minimum. Eventhough my engine has a lower compression ratio than the Mazda, it takes 91 octane because of the forced induction aspect. Forced induction greatly increases the amount of air sent into the engine to the point where "boost" is created (positive pressure in the cylinders). Boosted engines need a higher octane so that the fuel doesn't prematurely ignite from that high pressure in the cylinder. Naturally aspirated engines have a vacuum effect, where it "sucks" in enough air to fill the volume of the cylinder (or even less since naturally aspirated engines are not 100% volumetric efficient), so it can take lower octane fuel like 87 that can handle those lower pressures. In essence, the difference is the "sucking" or "shoving" of air into the engine. Now there are some naturally aspirated engines, like the 6.4 liter V8 hemi, that do take 91/93 octane. I'm not sure why they need higher octane, but I'm assuming because it sucks in a lot of air naturally lol. I hope all this makes some sense though. I didn't want to get too detailed lol. | |||||
| Answer to: Can I put 86 in my new Tundra | 33Relevance | 3 years ago | Whatchamacallit | Submit Your Question HERE | |
| We are talking about a difference of 1 octane (so 86 vs. 87 and not 86 versus 93 or 91) so you will probably be fine. I would use 86 and if there is no knocking continue to use it. In modern cars, the ECU should compensate for the lower octane and again we are only talking about 1 octane difference. As another example, for some performance cars in the owner’s manual state 93 octane required but some states only carry 91 octane, and yet those vehicles are sold (brand new) in those states. It turns out 91 is fine for those vehicles although there may be a small drop in power produced but the engine will not be damaged. | |||||
| RE: '06 Mazdaspeed 6 Power Loss, Sputtery feel in Acceleration | 33Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| @joshhuck All you do is fill up with 91 octane at the pump. You can mix different octane fuels, but it's best to fill up pure 91 octane. Mixing octane ratings will just average them out...so like mixing half 87 and half 91 will give a full tank of 89 octane. | |||||
| Answer to: Premium versus Regular in GS350 F sport 3.5 V6 306 HP 11.5 | 33Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| If it calls for premium gasoline (91/93 octane), I wouldn't suggest running regular gasoline (87 octane). Higher octane gasoline is important for performance engines like that. Switching to a lower octane will give you less power and may even cause knock. octane rating is not a gimmick. | |||||
| RE: Gasoline | 33Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| What you're asking makes no sense. First off, octane IS the measurement of a fuel's resistance to ignition under high pressure and heat. And higher octane fuels do have a slower flame propagation because of their resistance to ignition. THIS is why ignition timing is advanced. There's a correlation between octane and flame propagation. I hope you know what burn propagation is by the way. I just stated in my previous comments that high performance engines DO need high octane fuel to resist pre-ignition, and I also stated WHY they need higher octane fuel. You're not reading my explanations clearly. You're trying to play it smart with me again and it's not working. Do you really have no idea on all this stuff? | |||||
| RE: Gasoline | 46Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Well it depends on how your timing gets adjusted. Any engine that's controlled electronically will be able to adjust timing according to octane (or how the fuel is burning as determined by the ECU). It's one of those things where you have to experiment with different octane ratings. If your car recommends 87 octane, you can try 91/93 and see if there is a noticeable benefit. Most of the time there isn't a benefit to using a higher octane than what is recommended (it will just change ignition timing, that's all). You may notice better gas mileage and power when using higher octane when carbon build-up has occurred in the cylinders (carbon- build-up increases compression in the engine because it takes up space-- Scotty has mentioned this before). However, it is NOT advised that you use a lower octane than what's recommended. This can cause serious pre-ignition issues EVEN IF ignition timing is pulled by the ECU (codes will start to appear). You can add higher octane, but NEVER add anything lower than what's recommended. | |||||
| Answer to: Gasoline | 46Relevance | 5 years ago | Razmig Bartassian | Submit Your Question HERE | |
| This is only the case if your ECU cannot advance ignition timing to compensate for 93 octane (almost all modern cars can compensate for different octane ratings with special sensors that detect what octane fuel is in the tank, and almost all cars can adjust ignition timing). 87 octane has a faster flame propagation compared to 93 octane, so it can be ignited really close to top dead center and give you full power. Running 93 octane requires an earlier spark plug ignition to account for the slower flame propagation. So if your ECU cannot advance the timing, it will ignite the 93 octane fuel too late for it to provide a proper power stroke. The piston will already be moving downward by the time it fully ignites, and this causes power loss. The closer the piston is at top dead center when the fuel fully ignites, the more power it makes (more downward force on the piston). | |||||
| Distance to empty on Ford Escape 2014 | 40Relevance | 4 years ago | Benjilafouine | Submit Your Question HERE | |
| Hello, I have a tricky question. On my Ford Escape 2014 2.0L AWD turbo, I always fill the tank with octane 91 gasoline and I am always getting a 535 km distance to empty (could be 525, I’ll document next time). With gas prices going through the roof in the beginning of summer, I decided to fill the tank with octane 87 just to try and the distance to empty went down to 469 km (I still had a little bit of octane 91 gas in the tank). This new value puzzled me, considering that I never thought that my car “knew” the octane level in my tank. In fact, I became so curious that I decided to fill with octane 94 once the octane 87 tank was empty and the distance to empty jumped to 610 km! I decided to reset the trip counter to 0 and see how accurate this 610 km number would be. Since I live in the country and riding all the time on highways, I drove 300 km and strangely enough, the distance to empty seemed pretty accurate. How is this possible? | |||||
| Answer to: Do all turbos require premium fuel | 40Relevance | 5 years ago | Justin Shepherd | Submit Your Question HERE | |
| Back in the old days, when cars had carburetors and turbos/ superchargers, you had to put premium in them, or the engines could destroy themselves via fuel detonation, which is commonly called knocking. They had no computerized fuel injection or variable valve timing to help reduce this. My 1979 Pontiac Catalina has a 301 V8 is carburated with an 8.5:1 compression ratio and it's naturally aspirated, so putting premium in my car would be an absolute waste of money. The engine can't adjust for the higher octane, and it doesn't have high compression or forced induction to raise the pressure enough to cause spontaneous fuel ignition. In a modern turbocharged engine like the EcoBoost Mustang's engine the compression rationis 9.5:1 and they have forced induction. Sensors in the engine monitor the compression stroke constantly for pre-ignition and will adjust valve timing to either back off on the amount of air getting sucked in, or they can add additional fuel to cool the air on the compression stroke, both are options. None of this can be done with an old carburated engine. With those, air gets sucked in, pulling fuel into the airstream at a fixed ratio, determined mechanically by screws, then it gets burned in the engine. Valve timing is constant, with no advance or reduction in timing based on load. Low octane gas needs removed or it will destroy the engine because it can't be compensated for. Your Kia is almost certainly fitted with the same sensors as the EcoBoost Mustangs are, so it will tolerate both high and low octane gas. You will likely notice a power difference with high octane fuel, as it allows the turbo to work to its full potential, cramming more air into the engine so the igniting fuel does so more explosively. You can't really hurt your modern turbo engine by putting high octane fuel in. Putting fuel with lower octane than that recommendation will more likely cause problems. | |||||
| 2008 Infiniti m35x 89 octane without ethanol or 91 octane with ethanol? | 31Relevance | 5 years ago | gsxr4dre | Submit Your Question HERE | |
| 2008 infinity m35x is it better to run 89 octane athanol free or 91 octane with 10 % or more athanol.? Thanks | |||||
| Sheetz 88 octane | 29Relevance | 2 years ago | TheBlackTop | Submit Your Question HERE | |
| Hey Scotty, I’m just watch your new video on gas station and what came to my mind is Sheetz 88 octane. Sheetz is the only gas station that has E85 and 88 octane. They said on google that 88 octane is use in vehicles after 2001 and my CivicR is a 2002. You think it’s ok I use it on my car and is it cheaper than regular? | |||||
| Answer to: Use octane booster instead of premium fuel? | 29Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| I do have a car that the manufacturer suggests using premium fuel and I use mid-grade in it with no octane booster. It makes no noticeable difference unless you lean really heavily into the loud pedal in which case you can feel the engine control system pulling back a little. Modern engine management systems are very good at adapting to different fuel grades but each model car can react differently. If your car really needs the higher octane to run properly you're better off just using the correct fuel with lab-certified octane rating instead of fooling around with aftermarket additives. | |||||
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