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https://tiresize.com/comparison/ That's a good website for checking your maths. Have a check on this but IIRC that there was a BITDI SE that did come with 17" wheels, you could look into those wheels as i guess if they fit a BITDI then they will fit your car. I have an 3.0 272 allroad with 255/40R20 tyres and I'm looking into winter wheels too, have you looked in your manual? I think although 17" will fit my car i think 18" wheels with 235/55R18s are recommended for my car.

Hello Ian, Many thanks for a very enlighten post. It seems that increasing the ethanol content to 10% results in a weakened mixture, which can manifest itself as a lowering of performance, and an increased consumption. Others may disagree and have better evidence than me that the consumption is not affected to any noticeable degree - it would be interested to hear of these experiences. Your post was of particular interest to me, since my 3ltr non-Audi was 3/4 filled with E10 and this seems to be disappearing at a rate of knots greater than when last filled with E5. Very limited, and not very scientific experience, but I intend to return to E5 and see what happens. Many thanks again for your post. Kind regards, Gareth.

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