Has anyone here ever tried (or read of someone trying) to compare the consumption of a traditional hybrid versus a plug-in hybrid or true electric car? In other words, that electricity is coming from somewhere, and what is the comparison between getting that power from your local utility versus burning a minimal amount of gas to do it. As a former mech eng I am famliar with the tradeoffs, etc....but a lot of work would go into such an analysis.

Has anyone done it?