Your input in this thread is fine, but make sure you echo your opinion here, where it will be heard by the decisionmakers:
Fuel Economy Label | Fuel Economy | US EPA
More info on the label is a good thing. I've also recommended that the EPA act only to inform, not to advocate.
My opinions on giving every last electric vehicle an "A+" and putting "tailpipe emissions only" in fine print below a big 0g CO2/mi label have been discussed at length elsewhere.