When I lived in Washington State, my auto mechanic said the Chevron sold the highest quality gas. So in moving to Hawaii, I assumed Chevron sold the same quality fuel, but just found out recently that especially for the state of Hawaii, each company creates a different quality product and that "Chevron is the absolute worst here, with Shell being by far the best". I have tried googling and looking through this site for any reviews about this but haven't found anything. Does anyone know anything about this, or where to look for factual data on this?

Sunoco makes very good fuel but I don't have it where I live. I go with Amaco (BP) or Shell. Nothing else.

I am lucky, i live in Europe. All gas have higher octane level here 95 and 98.

Gas is very expensive compared to American gas prices though.