I have no idea how, but I got an average of 41.4 mpg this morning on my 75 mile commute, according to the computer readout. With 10% error (the max I've seen between reality and the readout), that's at least 37 ish. Not bad! My overall (not just highway, but my in town commute, which was terrible because I went through the car wash twice with the vehicle on and was stuck at a lot of lights) was ~36, so at least ~32 ish for 20 miles in town plus 75 miles highway.
Huge improvements since I bought the car in January. I am thrilled, to say the least!