Originally Posted by
BRagland
Other than an issue with your PCV valve or some magical gasket failure, you have only one option: bad gas. I hate to point this out, but you might need to get off the high horse and realize it could very well be bad gas. No rudeness intended, but even stellar gas stations can be run by crooks using old gas to save money and impress the regional manager. Not everyone is honest. Including those working at otherwise respectable places.
There is nothing else to explain it, sorry to bring the bad news hammer.