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Thats not against anything alcohol injection reduces emissions, the lack of carbon build up in the engine shows that point, It really helps turbo diesels, But if you use a 40/60 mix of just good old washer fluid and use 87 octane you will still have around a 99 octane level you can go as low as 20/80 and still be way above 92 octane. Not to mention the car runs cleaner.

Why pay for premium when you don't have to, the kit will pay for itself with fuel saving and reduced internal engine wear , most people also notice a lower engine operating temps as well. There are no downsides to alcohol injection, and Turbo cars boost up quicker with less throttle just one of the many things you notice that is different. And a Audi are a snap to install a kit on.