My car takes 93 octane so I have to pay a bit more. After getting a tank of bad gas on New Year's eve I've been filling with
Chevron with Techton to clean the fuel system which also seems to cost a bit more. The other night I was in South Beach where gas also seems to cost a bit more. Paid just under $4 per gallon that night but normally I pay around $3.50 per gallon at the Citgo up the street from me.
BTW Chevron with Techton really does work. My car is running great after a few tanks and my car's fuel gage is also working properly now.