Meh, not even worth clicking on (no offense). Its just another sensationalistic headline.
Everything that plugs in should be measured by MPGe, not MPG. Otherwise, its possible to get infinite MPG in the Volt (and any plugin for that matter).
I do the same thing with my plugin kit for my Prius. The number you see in my signature is MPGe. My best tank last summer was a hair shy of 80 MPG, but only ~65 MPGe after you account for the electric energy usage.
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