Right now, my 1991 Subaru Legacy L Wagon is just getting worse and worse mileage as time goes on. I want to assume it's because of the o2 sensor. It's approximately 18 to 20 in the best averages when I drive it like grandma. Other than that, the fuel gauge does not last long and I use 10 gallons before I know it. It used to get anywhere from 23 to 24.
I'm in the money struggle enough as it is and this is just making things horrendously worse. I need some help asap if possible.