esheato, don't quote me on it, but I would guess we have the highest State and Local taxes tagged on, plus whatever State regulatory requirements that cause suppliers to add a few more cents per gallon to recoup costs.
It infuriates me, because I'm in one of the darkest red counties (Santa Barbara), and we have the world's second largest natural oil seep (Coal Oil Point) spewing tens of thousands of gallons of oil, and hundreds of millions of cubic meters of natural gas per year, just a half mile off our coast. Can't touch it though. Oil companies collecting it and reducing seepage = bad. Idiots.