91 Octane any good ?

 

its diluted shell gas and johnny walker black label. no i dont know who supplies it but im sure google does

 

It actually is Shell...

Reference and horror-story: http://seattlepi.nwsource.com/local/364597_gas26.html

 

ahhhhaaaaaaaaaaaaaa i was right

 

Who supplies circle K ?

 

Circle K is usually Union 76.

 

Costco is a mix of whatever is cheapest at the time: "Costco is able to keep its gas prices so low because we don’t acquire our gas from just one source. We purchase gasoline from many sources (BP, 76, Arco to name a few) – wherever we can get it cheapest at that time."- Costco rep.