My 2006 Civic gained 4 mpg after I swapped one cheap sensor

I put a $22 upstream O2 sensor in my 2006 Civic about 3 weeks ago and my gas mileage went from 28 to 32 mpg on my normal commute. The old sensor had 190k miles on it and was throwing no codes at all, just reading lazy. Has anyone else picked up mileage from a part that never tripped the check engine light?

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