Just got my ultragauge (which I know will probably be way off on my HX, but I needed the OBD ability). I set my alarm for PM so needless to say I was a little rushed on the way to work but still got 36 mpg. On the way back where I could slow down and pay more attention I managed 53 mpg.
I'm guessing my work place is at slightly higher elevation since that's a pretty significant difference. Will find out tomorrow. But if the ultragauge is metering correctly my real numbers should be slightly higher since it can't account for lean burn and doesn't seem to register DFCO either.