I had the chance to meet with the folks at the largest refinery in the nation (Chevron - Benicia, CA). I was so unimpressed with their approach to technology that I have not bought their gas (unless under extreme duress) for over 15 years, nor will I allow my wife or kids to buy gas their. Anyone who runs a high perf engine can tell you to stay away from Chevron gas...it will ruin your engine. For the same grade/cost Texaco or Phillips is better for higher hp engines.