There aren't that many gas companies out there who actually manufacture it. A lot of the time they're smaller outfits that buy it from a big supplier. There are differences between different suppliers though. If you see gas for really cheap all the time, then it's probably cheap. Occasionally someone will do tests of gases but I don't remember the last time I saw one. Chevron is actually one of the big companies so you are in fact getting Chevron gasoline. There are places around here such as 7-Eleven and Candian Tire whom I've been told to avoid, since their quality is really cheap.