ARCO at 136 College Avenue, Santa Rosa, California.

Best prices for gas within 20 miles or so, as is the station just up the road. This station has it's benifits and drawbacks though.
Benefits: Great prices, easy (southbound) freeway access, Subway sandwich store attached to station in case you are hungry, and the station has a mini-mart inside.
Drawbacks: Difficult to enter or leave if you are driving Westbound on College Ave., extra 35 cent charge for using ATM card.

If you are driving Westbound on College Ave, there is another station just up the road that has the same prices but isn't as nice. It's an option if you have a hard time accessing the entrance to this station, but not if you want a sandwich too...

Good friendly people great assistance if needed.