There are some price variances by brand. but Chevron is considered the premium brand around here. They have refineries in Richmond and in El Segundo. We are likely getting product from El Segundo. Supposedly, with their package of additives, Chevron offers the cleanest burning gas in the state. I know I have never had an issue with Chevron ... no engine pinging, engine sluggishness, or misfires or any of that stuff ... Nor have I ever had to replace any fuel injectors, or O2 sensors or catalytic converters or any of the stuff that low grade gas would shorten the life of, so I continue to be loyal.
I bought gas earlier today and paid $4.37 at Chevron. I admit to seeing signs at a couple of the independent stations for as low as $3.87.