From the "It Can Happen With Any Gas" file, A few years ago on my way to work in my daily driver I filled up at the local Texaco. My tank was almost empty when I pulled in there and after the fill up I made it about 8 miles before the car started loosing power, missing and stumbling. I had to have it towed to my brother's shop. He determined it was a fuel problem but it wasn't for the lack of it, it was the fuel itself. It wouldn't burn like gas usually does. I contacted the Texaco and they had a recall for all of the customers that bought gas on that day, explaining that the batch of gas they received from the local refinery had 5 times the maximum levels of polymers normally found in the mix. They paid everyone the cost of flushing fuel systems, dropping tanks and injector R & R's. I am REALLY glad it didn't happen to my 308 at the time. It would have buggered the carbs terribly.