I've learn that the Bosch and GM O2 sensors work on non ethanol pump swill okay but not so good on all the other pump fuels out there now whiney
If your wanting a better sensor for the other fuels the NTK ones are the best ones out there, not cheap but they work very well and live up scope
Leaded race gas will kill the standards Bosch and GM O2 sensors rather quickly whiney shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)