For the past few months I noticed I've been visiting the pump quite often...I set the issue aside for a while and now I just can't take it anymore. I came about calculating my gas mileage the other day and it seems I'm getting around 11-12 mpg (car rarely sees highways anymore) which is pretty pathetic. I'm thinking of replacing the o2 sensor since I had a clogged cat a few months back, other than that I'm pretty stumped on this one. Any insight would be appreciated.