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    View Poll Results: Do you always fill up with premium?

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    • Yes

      100 88.50%
    • No

      12 10.62%
    • It doesn't matter

      1 0.88%
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    Thread: Do you always put premium in a car that recommends it?

    1. Don't be me. Don't be a 'Rick' Cabin Pics's Avatar
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      09-17-2019 01:29 PM #1
      Curious how you guys feel on this. Any of the newer cars (2000+ ?) that "recommend" premium will usually run fine on regular, they just pull timing back a bit and you lose a little bit of power at the top end. With that being said, do you always run premium (91+) in your cars that recommend it, or if you're just putting around town will you run regular every now and then?

      I always run it in my 325, but in the wife's SQ5 she decided to start filling up with 87 instead of premium. After driving it a few times, you can't tell any loss of power until you're deep in boost, even then it's more than enough power. Considering she only drives 4-10 miles per day, I see no problem with this.

      I'm also curious to see if this becomes more common if gas prices start to rise. Will more and more people decide premium isn't worth an extra $0.50-0.75 per gallon?
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    3. Member Smooremin's Avatar
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      09-17-2019 01:31 PM #2
      Yes. I do what I am told to.
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    4. Don't be me. Don't be a 'Rick' Cabin Pics's Avatar
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      09-17-2019 01:32 PM #3
      Quote Originally Posted by Smooremin View Post
      Yes. I do what I am told to.
      Is it a requirement or simply a recommendation to get the best performance? Will it void the warranty?
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      09-17-2019 01:34 PM #4
      Quote Originally Posted by Cabin Pics View Post
      Is it a requirement or simply a recommendation to get the best performance? Will it void the warranty?
      Generally, it's a recommendation for best performance when it says "recommended". On the G90 it's clear in the owner's manual: premium is recommended for max performance (450 horsepower), but it will run on regular at reduced performance (429 horsepower). I think Ford is a little more ambiguous and there's fine print somewhere that their performance cars are rated on 91 or 93 octane.

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      09-17-2019 01:34 PM #5
      It’s a rental, of course it gets 87.
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    7. Member ice4life's Avatar
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      09-17-2019 01:39 PM #6
      Yeh I imagine you're talking about the sq5?

      With modern engines, if you put in a lower octane than recommended, the computer adjusts everything to offset knocking potential. Ie: lower performance.

      I have always put the recommended fuel in, and have had some weird ones like the 2012 Passat VR6 which took regular when their less powerful turbos at the time were running premium.

      I'm not sure this would lead to warranty voiding, unless there was some direct connection between your engine issue and your gas type. I'm thinking of the carbon build up stories from using bad gas.

      It def adds up. The Arteon takes premium, and I've already noticed a difference in my gas outlay. It compounds quickly at the higher price.

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      09-17-2019 01:40 PM #7
      Porsche: always premium
      Alltrack: sometimes RUG, sometimes premium, VW says the performance is better on premium and my butt dyno confirms.

      From my understanding of turbo, high compression, DI engines it is low RPM detonation that is both common and really bad for them. I'll gladly spend the extra $10 a month to keep my engine safer.

    9. Member Uber Wagon's Avatar
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      09-17-2019 01:41 PM #8
      Quote Originally Posted by Cabin Pics View Post
      Is it a requirement or simply a recommendation to get the best performance? Will it void the warranty?
      Don't know about the Audi, but the first thing MB mechanic does is check to see if the owner placed premium gas...with cars that come in with CE issues. Then the owner should get ready to pepper their angus at their discretion.

      Gas is cheap in this country, so I always put premium as recommended.
      Last edited by Uber Wagon; 09-17-2019 at 01:43 PM.
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    10. Member 88c900t's Avatar
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      09-17-2019 01:44 PM #9
      MSM or anything old=ethanol free premium.

      Focus ST: should get premium, really just put E15 which is 5c cheaper than 87. It's not like I keep cars that long anyway.
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    11. Member adrew's Avatar
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      09-17-2019 01:48 PM #10
      Some cars say recommended; others say required. I've always been of the mindset that if a performance car recommends/requires premium, but if it only gets driven in a sedate manner, that 87 is fine. The computer might retard the power a little, and you might lose a smidge of efficiency, but most are smart enough to avoid pinging. If it gets romped on I would always use the spec'd grade.

      My car only requires 87 and is fine on it most of the year -- but I do put midgrade in it in the summer when it is 100-110° because it feels like a total dog on 87 and revs reluctantly instead of enthusiastically zinging out to 6500.

      I use the entire rev range and all of the accelerator and hate when I can feel the car pulling timing. I never really notice it in an automatic car but in a low-powered manual car it is really apparent in certain situations, like when you come around a corner in 2nd at 15 MPH, then floor it -- there are 2-3 hiccups of slight hesitation that almost feel like a misfire.
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    12. Member Jimmy Russells's Avatar
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      09-17-2019 01:50 PM #11
      Yes

      One thing I do not jive with - "Oh, it'll be good enough."

    13. Member steelgatorb8's Avatar
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      09-17-2019 01:53 PM #12
      Yes because DI turbo 4 cylinders. Ran 87 in the FoST one time when it was stock because I was in a bit of a pickle in the middle of nowheresville. Didn't enjoy the knock/timing pull experience that ensued.

    14. Geriatric Member @McMike's Avatar
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      09-17-2019 01:54 PM #13
      I put 93 in everything just to be sure.

    15. Member Pnuu's Avatar
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      09-17-2019 01:54 PM #14
      Personally... ALWAYS. Without fail. Even my cheaper cars are usually tuned to the point of needing 92 (the best we get on the Left Coast). I also see noticable benefits from the trademarked detergents included in the "top tier" premium fuels so that's also a motivator. I usually run Costco, Chevron, or Shell 92 in my cars.

      As mentioned, modern fully computerized cars (that haven't been modded) will theoretically adapt to a lower octane fuel and pull timing early enough to prevent serious detonation issues. So while you're "probably" okay to run 87 in an SQ5... It's still a potential gamble on long-term issues.

      If an OEM fuel systems Engineer were to provide a convincing argument to the contrary I'd consider changing my mind.

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      09-17-2019 01:56 PM #15
      Acura recommends premium so that's what I use. Only other comparable cars (RWD/AWD, N/A 6 popper, sedan) that burn regular are the ATS/CTS, which get worse gas mileage. Plus compared to regular it's like an extra $7/week. That's a worthy fee to not have to hear a 2.0T IMO

      Plus even if the computer can compensate... it's gonna do so by damn near flooding the engine and/or killing performance. I remember some gas attendant filled my 350Z with regular once... car burned more gas and felt weaker. So it was a net negative IMO even though I might have saved a couple dollars on the tank

    17. Senior Member UncleJB's Avatar
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      09-17-2019 01:56 PM #16
      Yes I always do in the GTI. I even put mid-grade in the Cabriolet because why not. Passat takes regular so that is what it gets.

    18. Member geofftii2002's Avatar
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      09-17-2019 01:59 PM #17
      I do not know more than my German engineering overlords. I do as they say.
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    19. Member Uber Wagon's Avatar
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      09-17-2019 02:00 PM #18
      Quote Originally Posted by geofftii2002 View Post
      I do not know more than my German engineering overlords. I do as they say.
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    20. Member The_Real_Stack's Avatar
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      09-17-2019 02:04 PM #19
      S2000: Always always always

      Old TSX: For a long time yes, then I saw premium was like $0.80/gal more and I said F it

      RDX: I trained my wife to always put in premium, now I want to untrain her. When I fill it it gets regular

      Other cars I borrow, like my new RDX loaner the other day: lolololol....87 unless I can find something worse

      Jeep: takes the cheap **** and likes it
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      09-17-2019 02:07 PM #20
      Until recently yes.

      But for past 6months or so I sometimes throw 87 in the allroad despite that one being a required.

      It's got bigger turbos, upgraded exhaust and is tuned by me, timing is ultra conservative at the moment so on the surface running 87 on a tuned car might seem dumb. But it pulls 0 degrees on 93 and barely anything (some timing pull is ok/normal) on 87. One thing to consider in my case is that these run stoic (as in super lean) deep into the power band and only enrich once it hits a calcuated EGT limit despite running full boost for 2k+ rpm in stock form. With it tuned how I currently have it the car enriches as soon as boost starts to ramp up. Basically if it was fueling like stock I'd be more concerned. There is a noticeable difference in power but if i know I'm just going to be commuting and not doing any logging/tuning I may throw in a half tank of 87 for that week.


      I actually was tuning the carb/timing on an old 4.2 AMC engined YJ a few weeks ago and wish the owner had been running 93, despite it running on 87 you couldn't get any timing into it on 87, probably could have made like 5-10% more power on 93.

    22. Member Yuppie Scum's Avatar
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      09-17-2019 02:08 PM #21
      I used to have a Sentra SE-R that wanted 91 but I gave her midgrade. It was fine. But for my current Acura, I give her the good stuff.

    23. ***** (Cat) Lover Pizza Cat!!!!'s Avatar
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      09-17-2019 02:08 PM #22
      Quote Originally Posted by chris86vw View Post
      Until recently yes.

      But for past 6months or so I sometimes throw 87 in the allroad despite that one being a required.
      Its not even required in the allroad.

      I do still use it (93), even though it’s stock.

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      09-17-2019 02:12 PM #23
      Quote Originally Posted by Pizza Cat!!!! View Post
      Its not even required in the allroad.

      I do still use it, even though it’s stock.
      91 min required (not recommended) in the allroad/all 2.7t applications.

    25. Member someguy123's Avatar
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      09-17-2019 02:12 PM #24
      SQ5 recommends premium, only?

      Besides the usual (knocks, less hp, less mpgs), I noticed increased carbon buildup when using a lower grade.

      Anyone use regular gas their Civic SI?

    26. ***** (Cat) Lover Pizza Cat!!!!'s Avatar
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      09-17-2019 02:13 PM #25
      Quote Originally Posted by chris86vw View Post
      91 min required (not recommended) in the allroad/all 2.7t applications.
      Incorrect. Read my edited post.
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