Sorry I can't quote numbers like the dim bulb who wrote this article--but yes, from my knowledge working for the feds, this article is a total distortion of reality. Most federal employees are severely restricted in their use of government owned vehicles.
Just an another point here--MOST of the employees at any agency are secretaries, clerks and other lower level employees. Anyone who thinks they are driving government cars are smoking the wrong kind of herb. It cost me a significant portion of my monthly pay just to get back and forth to the Dirksen Building.