I am seeing examples of Zone Pricing...
In my town, regular is from $3.08 to $3.13 per gallon. In parts of Charlotte, gas is in the mid 3 teens. While in other parts of Charlotte regular is $3.25 to $3.30.
In nearby upstate SC. In some places gas is $3.00 to $3.05....Across the very same county, just a few miles away, I bought gas for $2.85