Ken,
Perhaps, but you can bet that pump price has the sales tax built in to it. The state is gonna collect it, one way or the other.
I fill at a commercial dock (Janokvich & Sons) in LA, and there are no posted prices. The price is whatever they quote me verbally when I tie off. Suffice it to say, I've cultivated quite the relationship with those guys over the last couple of years, since my average fuel load is 700-800 gal.
Historically, Jankovich has been the least expensive fuel dock in the LA area for years... but they won't quote prices over the phone. I'll be filling up here soon, and will post an LA price thread in the topic.