Why is gas usually cheaper in Detroit?

Travel Info
Yesterday in Detroit I found a gas station selling gas for $3.41

Around the corner from me, (I live in the burbs) gas is selling for $3.53.

Travel Tips

I own gas station in Westbloomfiled, southfiled, and Detroit
it all about the city ware the station is. Detroit has more people then ware my other stations r so i can charge 1 cent to the gallon more then how much I bought the gas and i can still make a big time profit because of all the customers.
Others

Because in the metropolitian area there are more cars so the price is less and that will bring in more money instead of in the suburbs
coz they know the blacks and mexicans cant afford it, or their gas is mixed with water
good question..im tired to these gas stations takeing my money
closer to the local gas refinery
one on Michigan Ave in Dearborn
one on Fort Street
More north ya go, more it costs.
Good question, can't figure it out, they know the people can't afford it.