If so you are getting what you are paying for!! Not likely! Don't be mislead by "Top Tier" fuel, that only means it has the proper amount of detergent according to the EPA!
My dealers service department has had some local fuels tested and has found that some of the "Cheap" stuff has as much as 17% ethanol. No names but if you think cheaper is better you are way wrong!! Not doing your engine any favors either!