Could bad gas mileage be caused by LAZY O2 SENSOR without CEL?

I have had the car for almost two years now and the gas mileage has been getting progressively worst. I tried different spark plugs anything from STOCK to DENSO, NGK IRDIUM, SPLITFIRE, and BOSH +4 and did not make much difference.

Winter was the worse!

 

not sure how all of that translates to Miles off hand, but yeah a dying O2 sensor can cause poor gas mileage. Also there is a slew of other **** that can do it too. Check your K&N, it might be overly dirty or something. Tire pressures (too low and bad fuel economy) can also gut your gas kilometerage(?)...

 

Read my first three columns for mileage

 

You might consider the possibility that you are leaking fuel or that your gas station's pumps are not reading accurately. Those possibilites are easy to test.

 

Chuck, the quality of the gas lately is very poor. They are trying to reduce emissions and they are trying new formula's to do this. Winter gas is the worse. You will see the difference in the summer gas. I think New York State also wants you to use dry gas more in the winter because the gas is so bad. Try different gas stations or Sunoco 94 octain and see if there is any difference. I say this asuming that all of your tune up parts are new. The O2 sensor should be changed every 75,000 miles. You won't be waisting your money or time.

 

And the dead walk amongst us again, lol!