2 problems I notticed on my drive to St. Louis today: 1) Heater smells like antifreeze 2) My fuel economy for this trip usually averages between 29-30 mpg. This time I got 23mpg. Same speed, no traffic. It was very cold and rainy most of the trip, if that has anything to do with it. I just changed the oil yesterday, Motorcraft 5w-20 synthetic blend. 5800 miles on the car and 2 oil changes done. Any info as to what could be causing the smell and poor economy would be appreciated.