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    Thread: which octane gas is best ?

    1. 04-12-2012 11:50 PM #1
      Hello everyone, I am curious as to what your findings or experiences are with the different octane gasoline choices. Which gave you best response or MPG's ? and which is best shell or mobile?

      I am driving VW Passat 2012 2.5 SEL Silver, love it only throttle is weak is it because of gasoline?

      Thanks much

    2. Member capclassicv2's Avatar
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      04-13-2012 12:25 AM #2
      I don't think the octane will change anything in the 2.5. It's designed for regular fuel and it won't improve on premium. And if it is any kind of difference it's too slight to notice. You'll end up wasting money in the long run.

      http://www.cartalk.com/content/premium-vs-regular-1

      As far as the throttle response, it won't change with the gas either. So save the money, and use regular. Just make sure you use trusted gas stations and you should be fine.
      Last edited by capclassicv2; 04-13-2012 at 12:47 AM.
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    3. Member DasCC's Avatar
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      04-13-2012 01:28 AM #3
      Stick with reg and hit the throttle a bit harder.


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      04-13-2012 04:17 AM #4
      No need for premium without a retune of the ECU.

    5. Semi-n00b
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      04-13-2012 07:37 PM #5
      Duh.........Diesel!!!!!!!!

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      04-13-2012 09:01 PM #6
      Quote Originally Posted by Daddydiesel View Post
      Duh.........Diesel!!!!!!!!
      +1

    7. Member Kyosho's Avatar
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      04-13-2012 09:55 PM #7
      Don't change to premium, because you will waste you money. Stick with gas, and go to a good, well known gas station, that there is always traffic at.

      Diesel on the other hand, although better, is still not as good as it is in Europe.

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      04-13-2012 10:02 PM #8
      Regular, many times if your car isn't tuned/set to run on premium it can actually have a reverse effect of what you'd expect running premium would have. I know this from experience.
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    9. Member cfurman's Avatar
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      04-14-2012 03:21 PM #9
      Quote Originally Posted by Realmjump View Post
      Regular, many times if your car isn't tuned/set to run on premium it can actually have a reverse effect of what you'd expect running premium would have. I know this from experience.
      the 3.6 calls for Premium fuel...

      if I run Reg, I can feel a difference, it is also a little noisier.
      Last edited by cfurman; 04-14-2012 at 07:46 PM.
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      04-14-2012 04:48 PM #10
      Quote Originally Posted by cfurman View Post
      the 3.6 calls for Premium fuel...

      if I run Reg, I can feel a different, it is also a little noisier.
      3.6 yes, as well as the 1.8t, which is all I've ever put into these two cars. My wifes Subaru on the other hand does not play well with premium.

      For the 2.5 in question I'd only use regular
      2012 Passat 3.6
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    11. 04-14-2012 11:40 PM #11
      Don't know what the new Passat 2.5L manuals say, but my 06' Jetta manual mentions that 91 Octane is recommended, and 87 octane can be used with decreased performance. My guess, the car can and will make changes to the timing depending on the octane rating of the fuel, but I highly doubt you'll notice a significant gain in mileage, or performance...and you definitely won't notice a thing for at least a tank of fuel. Best bet is to run the cheap stuff, it'll likely save you more money than you'll gain by the extra mpg the good stuff gives you.

      Don't know why the V6 would require premium fuel, is the compression THAT much higher? I know both of my motorcycles run compression in the 10:1+ range, but both are designed for regular fuel. Whereas my vintage firebird requested premium fuel for 9.5:1 compression in an iron block/head motor. Odd stuff I tell ya.

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      04-15-2012 12:40 AM #12
      The 2.0T in my GLI got several tanks of 89 vs 91 the first time when gas shot up and 91 was almost $5 and I was strictly commuting. Overall it wasn't much differnt.. It revved a bit higher had a little less power and got slightly worse mileage. When it went under 4 bucks i went back to 91. I'd like to tune my 2.5 Passat for 91 but it's almost 5 bucks again.. Miss that 2.0T

    13. 04-15-2012 04:17 PM #13
      87 is recommended, the sticker inside the gas door will tell you what is recommended in the US and Canada.
      -Joe-
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      04-16-2012 09:45 AM #14
      Does there seem to be any significant performance difference using an ethanol blend vs "pure" gasoline? I"m wondering if the price premium that stations touting "pure gasoline" charge is worth it.
      Partner: 2012 Passat SEL 2.5L, 2000 Audi A6 (non-Quattro), 1996 Audi A4 (non-Quattro)

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    15. 04-17-2012 10:40 PM #15
      Slightly better fuel economy will be seen with an unblended fuel.
      -Joe-
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