Ok now I am seeing this 12mpg thing too. I have an '05 GT convertible automatic. Bought it used at the 900 mile mark. I am now at the 4000mile mark. At first mpg was around 17-19 but now down to 12. I did not employ the variable acceleration deceleration methodology proposed. Is there anything I can do. My car is stock, other than a locking gas cap.
tc
tc