Terrible MPG, emission sensor code?

[Grapes]

I got my car scanned, check engine, security, ABS are all on.

the guy said an emmisions code popped up. he reset it all and told me to see if they come back.

i WAS getting terrible gas mileage, after a short trip i could see it moved a tick. i was filling up more often too...

now thta he re-set it, ive been driving around and the gauge seems to not have moved very much. how did that happen, and will it re-occur? is my car in a facorty set mode right now?

[redzmonte]

If you can read the code and post it that would help allot. could be a vac leak or it could be a faulty sensor... hard to say. if/when it comes back on post the code.

S