Every fall after the outside temp begins to drop into the low 50 deg range, my gas mileage goes down a couple miles per gallon. It's not yet cold enough to have to idle the car & warm it up before driving so I am unsure of what could becausing this. I am guessing that there is a sensor changing the fuel mixture or something related to a sensor that is causing this to happen. Any ideas?

Thanks,

Barry Watson
Geneva, Il.