Nice comparative graph of the cost vs. effectiveness of various technology measures for improving auto fuel efficiency. It would be interesting to see how the efficiency gains are altered if the improvements are implemented at same time, rather than individually.
Source:
Taft Foster and Thomas H. Klier, 2009, “Raising automotive fuel efficiency,” Chicago Fed Letter, Federal Reserve Bank of Chicago, No. 266, September, available at http://www.chicagofed.org/publications/fedletter/cflseptember2009_266.pdf
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