Wholesalers should charge whatever the market will bring. If a nationwide gasoline wholesaler has stiffer competition in one region due to competition from a regional wholesaler, they should feel free to compete with better prices in that region. By no means does that obligate them to reduce prices nationwide. If you think prices are unfairly high, then you have the option of a) not buying the gasoline, and/or b) opening up your own gasoline wholesale business. Should you decide that both of these options are too inconvenient, then you know what you are paying that wholesaler for: convenience. Everyone knows convenience stores charge a premium.