About the only thing I do with the Ultra is to always use premium gas (91 octane or better). Never bothered sticking to one brand, although I find myself filling up my cars and bike at the local WaWa simply for convenience. Had a family member who worked for a refinery years back, and he maintained that in the refining process, they all come from the same place. When the refined gasoline gets to the individual brands storage facility, that's when they add the ingredients the gas companies are always telling you about on TV. That was, however, years ago, so maybe things have changed....