[brucepick]

I've also asked about a lean burn indicator.
Message board posts on this site and elsewhere came down pretty strongly saying that no USA-market HX cars had one. Probably no HX's at all had such a display.

Right now I'm using a late-version ScanGauge, the version with X-Gauge included. SG displays 4 digital readouts, all harvested from the car's OBDII computer monitoring system. It will read (nearly) instantaneous MPG, average MPG, gal/hour, engine temp, throttle position, etc. etc. You select four to be displayed at any one time.

X-Gauge lets you determine custom gauges that the SG will display, and one that I use is a lean burn indicator. It's real tough to keep my HX in lean burn in the winter. I don't know if it gets better in warmer weather.