I am a Sales Engineer and I drive about 2000 miles a month. I was getting 13 mpg with my jeep and now I am getting between 52 and 55 mpg with my Prius. I drive every possible combination of road conditions that you can image, it does take a little adjustment in your drive habits to achieve a higher mileage in the Prius but the change is small and is the way you should be driving any way.