Brian,
Well, I live in Placerville and drive to Sacto everyday for work. I have memberships at a couple of different cardlock places, so that wouldn't help you. The cheapest place I know of is a Tower Mart in Folsom that is right now $1. 56, a Chevron in Placerville right off the freeway is $1. 61.
Now if you happen to be south of Sacramento, last weekend on the way home from Tulare (the DEPO show), stations from Stockton to Tulare were in the $1. 33 - $1. 39 range!!! on highway 99.
The Chevron in P'ville is on Placerville drive right off highway 50 next to an OfficeMax and In&Out Burger place. You can't miss it.
Tom