one thing I've always made sure to do was to get good gas from a place that is respectable. When I'm down in the dirty south I normally go to chevron. The ZETEC sure loves that techron and I'm sure the duratecs will too. Up north I'm normally around the WAWA's and Sheetz. I absolutely REFUSE to go to any place that sells more alcohol than other beverages. Or any place that just looks run down. They're probably a little desperate for some extra cash and therefore get the cheap gas or water it down some. I make sure the gas I put into my baby comes from a well known company and the station itself had better be in good condition.
And my lucky pump number is 5. Never gone wrong at that pump.