Idk if it's just the winter weather that is causing this or deeper issues but I'm at half a tank of gas and only driven like 120 miles.. I used to get almost 200 at least in the past summer I was... Maybe I should down some injector cleaner and some sea foam again? Any other clues as to what or why my milage would drop like this?

Sounds normal, its the cold.!

Winter blended fuel. It burns alot faster then a summer blend.

Well thats just dumb! ha..

In my celica I could get up to 750 KM per tank on the highway...stricly highway, and in the cold winter months, I would do around 400-450 KM per tank going to work.. just to show how the temperature and how you drive the car makes a big impact.

Same **** with my civic, in summer I could get over 500 KM per tank now im hitting 400 and its time to think about filling it up!

well that makes me feel a lot better.. I was afraid she was just slowly dying on me or something...

don't be afraid to buy a new 02 sensor also...

check your tire pressure too, maybe an oil change?

I met up with agentzero0 the other day, and we got to talking about this. Both of us noticed that our gas mileage dropped drastically when it got cold this year. When it warms up a little bit, my gas mileage gets better, but when it drops below 30, I can't get good mileage for anything. I don't know if it has to do with my aftermarket intake, because with my factory intake last winter my mileage didn't change. Just an observation.. But yeah, mine has gone south also.

>
I honestly can say i have never noticed this problem probably not as cold here