I'm getting horrible gas mileage.

Keeps dropping. used to be 240 a tank. Down to about 200 a tank.

I replaced the o2 sensor. Threw in some injector cleaner.
I have done the major tune-up with in the year...

What gives? Any Ideas....

 

Keep your foot out of it

On a serious note, tire inflation, alignment, all filters, go back and check up on your tune up, something may have come loose, or broke premature, Clean IAC, reset brain.

Steady idle?? If not, possible vacume leak.


MRS camaro is getting around 275 a tank and she does not drive idealy for MPG either.

 

maybe covered in the full tune up, but did you change all the fluids, including axle? replace gas cap. yeah, check tire inflation. drive more downhill. check plugs for fouling, wires @ night for fireworks. you know the drill.

 

that sounds about right, I get 130-150 a half tank, use to be closer to 160 but gas is so high that buying the 94 stuff is out of my price range.

 

Good point about the tires; I should check mine, too. We're now enjoying 55 degree days instead of 90 degree days; I bet the pressure in my tires is just a little low!

 

They are brand new tires.

255's in the rear. But I know they are not low....

 

What has the air temp done down their KJ???
On another board I go to, all people are complaining about their mpg going down due to colder weather. Colder engine requires more gas. If your temps have dropped, that may be your prob.

I would still go back and re-check your tune up.