With the rising petrol prices and my 66l tank in the B4, I just had to look around and find a cheap alternative. Since my cone brother is grain burner and he has already dealt with it with his brother, I had immediately a contact point. The magic word was E85 !!! Almost such a kind of schnapps gasoline, with about 105 octane. (15% petrol / 85% ethanol) Meanwhile the brother of my cone mate has made himself self-employed and sells as “totalflex” conversion sets for different edene Fahrzeugzeuge, only unfortunately not for my Audi 80 B4 2,0l 90PS !!! grrrrr Something doesn’t fit because of the monojet injection or something like that. Now I have read something and I have come to the conclusion that you could try such an Audi Bj.92 (value 1000-2000€) times to drive the E85 without conversion (somewhat thinned). After a little hesitation now at 63% ethanol part, and the car runs great and if not everything deceives me even more economical. ine B4 still continues!!! Has a long-term experience with E85 in the Audi B4???