So apparently there is a new standard for fuels containing detergents insuring less carbon build up in combustion chambers as well as on valves. I'm not sure if this means the fuels listed will be of better quality as far as octane and clean burn. Check out this link http://www.toptiergas.com/why.html I have none of the listed brands in my local town. I've filled up every time at Exxon. The other brands are those "cheap" ones like Sheetz, Kangaroo, Citgo, and Hess. We do have two Amocos, but they're more expensive. I remember Amoco being very highly rated back in the early to mid 90's.