On March 12, the Department of Energy will publish a proposed rule in the Federal Register requiring federal agencies to reduce petroleum consumption in their vehicle fleets by 20% by October 2015, measured against 2005. The rule also requires a 10% increase in alternative fuel consumption per year from 2005 levels by 2015, and will serve as the implementing rule for Section 142 of the Energy Independence and Security Act of 2007 as well as Executive Order No. 13423 and Executive Order No. 13514. The proposed rule would cover the Defense Department, Interior Department, and the Postal Service, the government’s three largest petroleum consumers.