Lots More Information

Related HowStuffWorks Articles

• How Adaptive Headlights Work
• How to Buy a Fuel-efficient Car
• How the 2008 EPA Fuel Economy Ratings Work
• How to Get Better Fuel Economy
• Can a car get 100 miles per gallon?
• How EPA Fuel Economy Testing Works
• How Hybrid Cars Work

More Great Links

• IIHS -- Daytime Running Lights Q&A's
• Fueleconomy.gov

Sources

• "Frequently asked questions (Road)." Transport Canada. Nov. 7, 2006. (Aug. 1, 2008)
  http://www.tc.gc.ca/road/faq.htm#daytimerunninglights
• "Highway Statistics 2006." U.S. Department of Transportation: Federal Highway Administration. Feb. 27, 2008. (Aug. 7, 2008)
  http://www.fhwa.dot.gov/policy/ohim/hs06/index.htm
• "Lane Courtesy." National Motorists Association. (Aug. 1, 2008)
  http://www.motorists.org/drl/
• "Low Beam Headlight DRLs." AllQuality Custom Auto Accessories. 2008. (Aug. 7, 2008)
  http://www.daytime-running-lights.com/Headlight_DRLs.html
• "Option 1G: Limiting the Use of Daytime Running Lights and Optional Lamps." California Energy Commission. (Aug. 7, 2008)
  http://www.energy.ca.gov/2005publications/CEC-600-2005-024/addendum_individual_files/
  CEC-600-2005-024-AD-1G.pdf
• "Q&As: Daytime Running Lights." Insurance Institute for Highway Safety. January 2008. (Aug. 1, 2008)
  http://www.iihs.org/research/qanda/drl.html
• "U.S. Retail Gasoline Prices." Energy Information Association. Aug. 11, 2008. (Aug. 14, 2008)
  http://www.eia.doe.gov/oil_gas/petroleum/data_publications/wrgp/mogas_home_page.html
• "Where does my gasoline come from?" Energy Information Administration. April 2008. (Aug. 7, 2008)
  http://www.eia.doe.gov/bookshelf/brochures/gasoline/index.html