"I HAVE A 2005 PRIUS. ON THE HIGHWAY DOING 75 MPH, WITH THE AIR OFF, I GET 54.SOMETHING. IN TOWN I GET 46-47 MPG. THE CAR HAS 17000 MILES ON IT AND USES MOBIL 1 SYNTHETIC OIL. CAN'T WAIT TO MAKE IT A PLUG IN HYBRID." --JERR

My car is a Honda Civic Hybrid 2005. I commute 40 to work each way, 5 days a week in LA. I typically drive 65-80 mph. I only sometimes have to drive in stop and go traffic. I drive around town only moderately. When I first got my car, I was really careful about making sure I optimized my mpg. I have stopped being so careful, but am still moderately efficient. I started out using 87octane gas then switched to 89. Gas octane doesn't seem to make any difference in my mpg. Over the last ~17000 miles, I have averaged 46.1 mpg. I sometimes get higher but usually right around 46 mpg for each tank.