Problem is that sports car drivers don’t drive their cars with the expected EPA mpg. My car is rated for 18/25, I barely get 16mpg and I am still on the freewa

Problem is that sports car drivers don’t drive their cars with the expected EPA mpg. My car is rated for 18/25, I barely get 16mpg and I am still on the freeway quite a bit. I’m less aggressive than I used to be when I was getting 11-12mpg.