I understand the skeptism and its warranted. Agreed my analysis is based on the OBC, only because I am lazy to go calculate otherwise. To be honest, the OBC read 29.7mpg at the time I exited the highway, 29.4 was what it read when I got to the mall after hitting traffic. My fuel gauge was just under half when I reset the OBC shortly after putting it in 8th gear, it moved a few ticks, maybe 2 if I remember well from there when I arrived.

Unfortunately I have no long drives planned until the summer when I plan to drive to Toronto or Montreal. This weekend I have a 100 mile round trip, will see how it works.

Trust me, I am as suprised as you are and would appreciate if others could experiment with this as well.