Fuel Question

[yss]

I was reading the manual and recommended fuel type is 91 or higher. For a stock 3.0 T with no mods, does using 93 octane fuel make any difference?

[SinCityA6]

On a stock motor, there is negligible difference between 91 and 93. Generally, both are not available in the same area anyway.

[OmaHahn]

On a stock motor, there is negligible difference between 91 and 93. Generally, both are not available in the same area anyway.

+1 AND..... make sure there's NO crap Ethanol in the gas!!!! Most of the 93 Octane fule has 10% Ethanol which is the EXACT same Octane percentage/ratio you will find in a 91 Octane with NO Ethanol.

[yss]

+1 AND..... make sure there's NO crap Ethanol in the gas!!!! Most of the 93 Octane fule has 10% Ethanol which is the EXACT same Octane percentage/ratio you will find in a 91 Octane with NO Ethanol.

I think all 93 octane fuel around my area has 10% ethanol. I will have to pay closer attention. Thanks for the heads up.

[pesticidal]

+1 AND..... make sure there's NO crap Ethanol in the gas!!!! Most of the 93 Octane fule has 10% Ethanol which is the EXACT same Octane percentage/ratio you will find in a 91 Octane with NO Ethanol.

It's nearly impossible to find non-ethanol fuel here. In Minnesota, it's mandated. grrr.

[MojaveA4]

I was going to say the same thing for California. Good luck

[GreatZar]

As posted here in another thread...http://pure-gas.org/

[ChipB]

Most of the 93 Octane fule has 10% Ethanol which is the EXACT same Octane percentage/ratio you will find in a 91 Octane with NO Ethanol.

I don't understand what you're trying to say. 93 octane is 93 octane, end of story, and ethanol actually has higher octane than gasoline. The only real issue with ethanol is that it has lower energy content than gasoline, so a 10% mix of ethanol will give you about a 3% decrease in gas mileage. But there's no issue with the octane rating.

To the OP's original question - as long as you use fuel rated to the car manufacturer's minimum octane recommendation (which is 91 of Audi in the US) you will optimize performance. There is no gain in buying 93 octane over 91. One other point - Audi recommends the use of gas brands that meet "Top Tier" guidelines - see: http://www.toptier