Much less energy is used to manufacture a vehicle than is used by the vehicle during its useful lifetime so a small improvement in fuel efficency would have a significent impact on the energy footprint ofThere are a lot more links in the answer, and obviously there are some people who don't drive much, and therefore their cars don't emit much carbon. But using the figures provided above, they would have to drive their vehicles 1/10th as much in order actually have CO2 emissions be dominated by production, rather then use.
the motor vehicle industry.
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A California-oriented paper http://www.environmentaldefense.org/documents/3986_CAautocarbonburden.pdf 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.
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posted by jessamyn at 7:29 PM on June 9 [2 favorites]