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The shop replaced my 02's this morning, car runs great. Still baffled why they went bad. Optic, Buzz and a couple other Vette's head up to Atlanta Dragway for the nights fun, I pull in the gas station where I always buy my unleaded race gas. As I get out to pump in a few gallons I see that the pump says "leaded"!!! wth! I am positive it used to be unleaded, the nozzle is the small size to fit the unleaded only filler neck!
So my mechanic was right - only leaded gas can kill an 02 like that. I ran about a 50/50 mix 2 times and it killed them.
The gas station (company?) may owe you for the O2 sensors and labor. I think they're violating something (state law? EPA?) when they use the small diameter nozzle to dispense leaded gas. Check with your state attorney general's consumer affairs office. :seeya