That's over $0.45 per gallon in taxes. Today's tank produced $7.61 in state and federal tax revenue.
And the other reason my gas is so expensive? California has special formulation requirements to make it burn more cleanly. That's good for the air, but it lets oil companies play with the prices since we can't just truck gasoline in from Nevada. The MTBE isn't good either, although that's supposed to be phased out. MTBE is some nasty stuff.
Then there's the difficulty of building or upgrading refineries in the state, although I doubt that bothers the oil companies as much as it bothers the consumer.
And a note on SoCal mass transit: It's not like the east coast, where you can hop onto a train and get where you want to go quickly and easily. Some areas just aren't served--you'd have to drive to the bus or trolley stop--and expanding the service to everywhere wouldn't pay for itself. San Diego is horizontal in its population distribution, unlike large eastern cities that are vertical.