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Old 04-12-2007, 08:24 PM
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Default 89 octance fuel or 91 octane fuel?

i have a 3.0 l a6 2004 , manuall recomends 91 octane or better. says can use 89 but will expreince loss of performance. Is this nessarily true. Also, Will the 89 mess up the engine? Would like to switch becuase gas prices are starting to suck.

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Old 04-12-2007, 08:33 PM
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Default RE: 89 octane fuel or 91 octane fuel?

89 octane should be ok ( as long as they say its ok in the book ) but you will loose some power and get less MPG but marginal,

UK Audi only allowed to use 95 or better but never seen anything lower than that here
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Old 04-15-2007, 08:36 PM
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Default RE: 89 octane fuel or 91 octane fuel?

I believe my 2.7T has higher compression than your 3.0 (but I could be wrong), and I've used midrange 89 for the past 60K miles without problems. I occasionally tried some premium but found no real difference in either mileage nor performance. But I never did an extended comparison. Neither do I run it hard either.

I did find the mileage suffered when I used midrange with 10% ethanol. Mileage is 1-2 mpg less. I avoid it but it's sold at the last station in MI before I go into Canada, and it's cheaper to fill at <$3/gal stateside than ~$4/gal in Ontario.
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Old 04-16-2007, 02:26 AM
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Default RE: 89 octane fuel or 91 octane fuel?

Think about it, the difference is about 10 cents a gallon and your car holds 18-20 gallons. If you can't afford the 2 bucks more per tank, you shouldn't have bought the car or you can skip your Starbucks in the morning. It does make a difference in the long run.
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Old 04-16-2007, 01:07 PM
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Default RE: 89 octane fuel or 91 octane fuel?

^ im with him. i only use 93 in mine. i know it costs a bit more, but id rather use the cleaner gas so theres crud built up in the motor over the years, i plan to keep this car for a while. i have programs in my chip for stock, 91 and 93. i can use anything from 89-93 basically, but i wont touch anything under 93, but thats just me
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Old 04-16-2007, 02:32 PM
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Default RE: 89 octane fuel or 91 octane fuel?

I don't fill anything other than premium, here in Canada they've started mixing Ethanol (10%) in with the fuel at some stations as well as some others have subpar gas really.

I generally go with Shell or Esso and go for their premium grades. It doesn't cost that much more per fillup but I like to think it makes a difference in the Audi. I had a 1990 Civic LX that was still running perfectly after all those years and I like to think it had at least something to do with the choice of gas.
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Old 04-16-2007, 11:01 PM
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Default RE: 89 octane fuel or 91 octane fuel?

I only use super 93 from ExxonMobil or Shell.
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Old 04-18-2007, 09:51 AM
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Default RE: 89 octane fuel or 91 octane fuel?

Not to be rude, but if gas prices going from $2.00 to $3.00 have an impact on your gas purchase, then there are other issues to be addressed.
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Old 04-18-2007, 04:46 PM
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Default RE: 89 octane fuel or 91 octane fuel?

I heard gas prices in the UK are much higher than USA.
Me, I use the highest possible. Haven't tried to put any octance booster in the tank yet...so what's everyones recommendations on that?

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Old 04-20-2007, 02:37 AM
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Default RE: 89 octane fuel or 91 octane fuel?

That what did i put in my brother AUDI in last vacation in EUROPE.

Click the image to open in full size.

100 octane SHELL , V-power racing

In USA i feed my A6 just PREMIUM or SUPER what's mean 93 octanes !!! LOL, EUROPEAN low octane # is 95 !!! Better then american PREMIUM !!!

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