For another comparison, in the US the price can vary as much as double within a couple of hundred miles. Miami Intl (MIA) is always the most expensive in S. Florida. No competition at that airport and the FBO chain is an expensive one. Currently US$8.00/USG. Only 23nm away at Homestead avgas is US$4.50 /USG self serve & US$4.75 full serve.
Meanwhile, a bit over 200 nm away, in N. central Florida, Palatka (28J) has if for US$3.79 /USG self serve. That's about the cheapest in FL although there are others closer to MIA still under $4/gal. Many. many more in the $4-$5 range.