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Sources

• Carty, Sharon Silke. "Luxury cars switch from premium to regular-gas diet." USA Today. August 7, 2008. (March 31, 2009)
  http://www.usatoday.com/money/autos/2008-08-06-premium-gas-regular_N.htm
• Fabin, James. "The Misguided Fear of Premium Gas." MyRide.com. (March 27, 2009) http://www.myride.com/lifestyle/the_misguided_fear_of_premium_gas-4120-page1.html
• Harley, Michael. "More cars than ever require premium fuel." Autoblog. April 17, 2008. (March 27, 2009)
  http://www.autoblog.com/2008/04/17/more-cars-than-ever-require-premium-fuel/
• Woodyard, Chris. "More cars use pricier premium gas." USA Today.
  April 17, 2008. (March 27, 2009)
  http://www.usatoday.com/money/autos/2008-04-13-premium-gas_N.htm