In the past week my fuel mileage has dropped really bad...like from 20mpg to 13mpg. I haven't done any type of work on it at all. There is no leaks, no gas smell of any kind. The performance has not changed either...running great! Not sure what to look for...any suggestions? Thanx!!

 

Maybe it is your driving style? Or O2 sensors perhaps...the only actual way to find out is to get it scanned.