so I checked my mileage today I am drivin back and forth to work 40 miles each way. been getting around 10. today I filled up and checked it again 7mpg. My engine light is on and trucks running a little rough. I just changed the plugs not to long ago. I know its not bad gass sinceI have tried 3 different places. Anyone have any ideas. Granted its been below 0 here for about the last 2 weeks or so I know weather would have something to do with this but. I am running out of ideas. Feedback would be sweet.

thanks

hell

 

have you felt a lost in performance??? maybe you cats are stoped up