I think this Arco has the cheapest gas in Torrance--and the Daily Breeze's "Gas Guy" actually has listed the prices that way many times. It is easy to enter and leave this station, with two streets on each side (each with a traffic light), so if it's just a little out of your way, come to this location, and save a few pennies.
They also have fair prices on smog checks, and they are quick and polite (I had my car done here).
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