hey my mpg's have been getting worse and worse sence i put some seafoam in my truck. i have no check engine light but could my O2 censors be bad causing the drop? i just changes the plugs, wires, and fuel filter and i have a K&N intake and a gibson cat-back on it too. and my tire size of 265/75/16 shouldnt drop it that bad.

 

when did the millage drop start? theyre using winter gas right now so everyones millage will drop around this time

 

Get a tornado in your intake man!

Actually I was just kidding. I was going to say check your o2 sensors. My Eclipse that I had was getting terrible mileage I mean like 18-20 mpg in a non-turbo 4 cylinder. My check engine light didn't come on either, but it turned out my 02 sensor off of my downpipe was burned out, and the computer just reset itself so it didn't throw a check engine light.

 

It very well could be the 02s. It also might be a combination of the colder temps and winter gas.

Rich

 

i noticed it starting about a month ago so i dont think its the winter gas cause it was still 70 out so im just gonna try to take one of the O2 sensors out and check it. cause im only getting about 120 miles to a half tank and i used to get about 170.

 

I'm used to having 260-270 per tank. Watered down gas don't help the situation.

 

one thing im gonna try is theres one gas station that has 100% gas no ethinol added im gonna try that and see if it makes a difference.