Thanks for the encouragement. This tank is looking a little better, might even break 39 with any luck in the next few days. The SGII tank mpg is never dead on because I EOC a lot and the shut down/start up time screws up the averages, but I crossed over half tank at around 285 miles, which usually means 39mpg. Today's traffic was a bit of a cluster (Wednesday's always are because nobody is telecommuting and it's a core day for my work), but I still managed 53mpg on the way in. Lately I've managed to get 31-32 on the way home (up the hill), so as long as I can keep it up for another couple of days, with my weekend plans it should be the best tank of the spring.
Next weekend I have a long trip to the western slope (read: one long climb, one short climb and massive glides). If that doesn't get me over 40, I'm taking a belt sander to the new tires.