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99 Octane petrol

Discussion in 'A3/S3/Sportback (8P Chassis)' started by James.Asbri, Jul 26, 2010.

  1. Star
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    Star New Member

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    [Aug 9, 2010]
    Wow - so the difference in price between 95 and 98 is about 5 cents, or 3p, but Vpower is another 17 cents (10p) on top of that.

    Running 98 is a no brainer now, but 99 - hmmm?
    #41
  2. warren_S5
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    warren_S5 Moderator Staff Member Moderator VCDS Map User

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    [Aug 10, 2010]
    Given the amount of soot and **** that sits around the tail pipes of my exhaust, whilst I accept some of it will be unburned fuel from short journeys, I hope that some of it will be whatever the V-Power cleaning detergents are cleaning out of the engine. These engines seen quite bad for carboning up due to the unique way Audi seems to have designed the FSi system, so based on that I try and use one tank of V-Power to every 3-4 tanks of Momentum 99 which is 4p a litre cheaper on average round here.

    I've never believed that anyone would be able to tell the difference between 97/98/99 RON, but if you run these high octane fuels and then go back to 95RON car you can tell a difference in the urgency. I ran Shell 100RON in Germany this year and the pull at the top end was noticeably better on the autobahns (much stronger pull higher up the speedo).

    If you read inside the fuel flap of the 2.0T's I'm sure it recommends 98RON as the preferred, and then 95RON as a suitable alternative. Pick one and stick with it to save the ECU having to go through continuous adaptation. I feel sorry for Americans, their fuel may be cheap, but 91RON must feel pretty weak in a performance car.
    #42
  3. FranA3
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    FranA3 events moderator Regional Rep

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    [Aug 10, 2010]
    ive made the switch to v-power as i have found a station close enough to use all the time and have already noticed a difference in the mpg going up on a run so will continue to use this as the idle is smoother to so all good so far
    #43
  4. Stev3n
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    Stev3n New Member

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    [Aug 12, 2010]
    Weirdly enough both v power and momentum have proven worse than the esso 97 did mpg wise. Going to switch back to 97 for the next few tanks and see if it's consistent
    #44
  5. Harrelson
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    Harrelson Member

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    [Aug 12, 2010]
    you will notice the effects on the 2nd or 3rd tankful. vpower has detergents that clean the injectors and lubricate the engine just like oil resulting in lower friction hence >MPG
    #45
  6. S3RYE
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    S3RYE Interior Next!!

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    [Aug 12, 2010]
    totally agree... also feel sorry for americans running modded cars on 91 :puke:
    #46
  7. xs2man
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    xs2man Member

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    [Aug 12, 2010]
    They do get super unleaded at 95 though. But they use a different method of calculation so I think it works out the same. Afterall they only have 4l per gallon, cause decimal places are too hard...
    #47

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