I have a 1994 Chevy C1500 w/a 4.3 v6 TBI How much will my mileage be affected by...

Bubba1992

New member
...a bad O2 sensor? My mileage has dropped from 18mpg to 15, I haven't changed anything major, at least nothing that should affect my mileage this much, I was getting that with a heavy fiberglass canopy, a 95lb winch on the front and about 500lbs of tools in the back, i just want to know if this could be caused by a bad O2 sensor. thanks
I have only ever heard of this model truck having one o2 sensor, if there is more than one let me know where they are please
 
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