Since you already own an HCH, you've got all the displays and gauges you need to drive efficiently.

However, for owners of cars with similar instrumentation, the ScanGauge can expose many additional details that can be used to further one's fuel economy performance - for many hypermiliers a scangauge is a biblical MUST HAVE. Anyway, on the HCH I set the scangauge to display the following gauge readouts (*=favorite):

cAI- air intake temp *
cWT- engine temp *
IGN-ignition retard or advance reading
LOD-engine load *
LPH- consumption rate *

On the Prius, I use:
cAI- air intake temp *
cWT- engine temp *
RPM=Engine RPM reading *
IGN-ignition retard or advance reading *
LOD-engine load
LPH- consumption rate

There are many other benefits to using a scangauge, such as using it as an OBD-II code retriever, and also as a very good trip computer - just to mention a couple more.


Cheers;

MSantos