"A California-oriented paper http://www.environmentaldefense.org/documents/3986_CAautocarbonburden.pdf http://www.environmentaldefense.org/documents/3986_CAauto

"A California-oriented paper http://www.environmentaldefense.org/documents/3986_CAautocarbonburden.pdf http://www.environmentaldefense.org/documents/3986_CAautocar... states that direct tailpipe emission of CO2 accounts for 68% of the average vehicle lifecycle carbon emissions, with 21 percent linked to production and delivery of fuel, and 11 percent are due to manufacturing, including materials production." So 11%. Pretty far off.