Chevron fuel's additive Techron is the only additive proven to clean engines and remove deposits. All fuel sold in the US contain a standard amount of detergent as required by law. All fuel delivered to each company is exactly the same from the refinery so the fuel you get at 7-11 is the same as Shell and Chevron, etc. The difference is what happens to the fuel when it's delivered from the refinery and before it hits the station.
Also, fillers can be added to fuel to make it go further. Some fuels can have 25% or more in fillers. Watch out for Safeway gas stations.
Buying gas at a no-name station doesn't mean it's bad fuel because the fuel is usually purchased from one of the name brand suppliers.
It's a crap shoot. I'd probably stay away from the places that don't appear to take care of their equipment. You're more likely to have problems as a result of poorly filtered fuel or other crud in their holding tanks.
I'd stay away from Costco as well. I have a friend that works for Costco. She said they purchase from whoever has the best deal of the day.
I'd also stay away from BP only because they like to crap on the environment and take no responsibility. That'd be Exxon too. Well crap... That's just about every oil company. IMO
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