California doesn't even have the same kind of gas as other US states. Supply is limited due to only a subset of refineries that can produce it.

Gasoline is regulated both by federal, local, and state laws.

https://ww2.arb.ca.gov/our-work/programs/fuels-enforcment-pr...

https://www.wearethepractitioners.com/index.php/topics/art-a...