Ok...I run with my AC set to 72, fan speed is usually medium (3-4 bars), then when the car cools down, I drop it to 1-2 bars. The AC is always set on ECO mode. I drive approximately 9 miles to work with 16 lights/stop signs. The speed limit ranges from 25 - 55 during the drive. I've been coasting whenever I can and trying to lightly use the gas pedal, which then causes me to go under the speed limit, then I apply gas gently to get the speed back up. I find I'm constantly gently pumping the gas pedal during the trip. I've gone a little over 500 miles. I've filled up once and still have 400 to go on the tank. I find myself tensing up during the drive and have to consciously relax myself and I'm only getting 31.8 MPG. My car also has the nav system. What am I doing wrong? Why am I only getting 31.8? I was hoping for 35MPG