You beat me! I had 27.78 mpg from New Jersey to New York State total of 288 miles. I was driving roughly the same, 75 mph average with the windows open, 38f/33r psi for the tires, BP Amoco Premium on both fillups with a pretty light foot (under 2500rpm for acceleration) with 4.44 gears.
I love the highway mileage
. Congrats to you as well.