Statements that some companies gasoline is "better" than another's, or from a different region of the world are ignorant. What is different is the detergent/additive blends put into the gasoline after refinement by the different gas companies. There are also contanimation issues that can occur in the delivery and storage of fuel in route to the end user. Almost all "bad gas" issues result from continamation of water intrusion, diesel intrusion, etc and these usually are the result of poor storage by the local stations.