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I'm considering an E85 tune, and have some questions. The car is a daily driven 2016 GT A6. Here in Sweden E85 is readily available and cost 50 % less than gasoline. Even if the car will use 30 % more fuel, I look to save 20 % on my fuel costs. I drive a lot, so this will save me about 1000 USD...

I'm not a mechanic, and probably will end up leaving it to a dealer.. :o But I thought I might not be the only one with this issue, and as I resolve it, someone else can come here and see what was the issue. The car is european, an automatic, has 17 800 km / 11 000 miles on it, and I've...