I have owned Three Audis over the last 6-7 years and they are the only cars that I have ever owned that seem pickey about the fuel you put through them. There are at times huge diffrences from one tank to another. HMMMMM, I thought it was the Audi Gods. Cheers, Jim Hahn '84 Ur-q '86 5Ktq RIP '87 5Ktq