how about the quality of costco gas?

[Jeffery Miao]

Well, Costco gas is really cheaper than most of the others (all of the others
in San Jose area, CA, where I live). All kind of cars, from the most
luxury one to the lowest end one, wait in long lines at my local Costco
gas station everytime I go there. But what I am concerned is how about the
quality of this gas, both in regular and super, comparing with other good
name gas, such as Chevron, Exxon, Shell, BP, etc?

I know the octan number doesn't mean anything about the quality of the gas.
It is the additive in the gas that determines its quality (correct me if it's
not true). The thing is low quality usually stays behind low price. Although
the super low price of Costco gas lures me so much, for the long term
maintenance concern, I don't want to risk my new '96 Nissan Maxima SE with
the #92 Costco gas before I know its quality at this moment.

Anyone has the clear idea about the quality of Costco gas? Are all the Costco
gas in the States same? Also, is there any place ranking gas quality of those
popular brands?

Jeffery
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Email: zho...@mailexcite.com