Article: Energy Efficiency: Potential Fuel Savings Generated by a National Speed Limit Would Be Influenced by Many Other Factors.

GAO-09-153R November 7, 2008

Gasoline prices are volatile and have increased greatly over the last several years, before dropping again recently. The national average of regular grade retail gasoline prices increased from about $2.24 the week of January 2, 2006, to a peak of $4.11 the week of July 14, 2008, an increase of almost 84 percent, before dropping to about $2.40 the week of November 3, 2008. High fuel prices have focused attention on conservation. Congress previously used a national speed limit as an approach to conserve fuel when, in 1974, it provided for a national 55 mile per hour (mph) speed limit to reduce gasoline consumption in response to the ...

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