Service stations service near Polk City, FL

I went to fill with gas as I was returning car the next day and had time to kill before picking up the kids from the shopping outlet. As usual practice, just selected grade and started pumping. I had half a tank and as it ws near full, I turned and looked at amount $70. I then saw that the price was $5.89/gallon. As a visitor, I went into the station and asked if that was what Florida gas cost ( maybe much higher taxes?). Guys says, no, owner sets the price, most other stations are $3.50 or so. I said, so what you are telling me is that you are ripping me off?? Guys, says again, owner sets price. When I leave, I see a small sign in corner of lot, unlit that displays price. Unbelievable that the city and state allow such businesses to rip you off. These are a direct reflection of the people that run the cities and government of this state and it's BAD.