Ok, I have been having a problem with my 94 4.6lt cougar. My gas milege has gone to crap! I was getting 8-14 mpg on average. I took it into the shop and they said it was the intake gaskets. They replaced them and still, its getting TERRIBLE milege. Ive gone 75 miles on half a tank! The weird thing is there is no check engine light or anything, and the car runs great! It idles fine, and drives smooth. I dont dont even drive the car hard. I got 17.8 mpg last tank when I had half a tank of highway driving. I cannot stand this poor gas milege. What should I check into? I cant really do anything myself because I know VERY little about cars. But this is just getting ridicilus.