Controlling pollution from mobile sources is vital to improving the quality of our air and protecting public health. The Clean Air Act of 1990 empowered the U.S. Evironmental Protection Agency (EPA) to take a variety of actions that have achieved significant results. For example, EPA reduced the sulphur in gasoline and diesel fuels and established successively more stringent emission standards, both of which brough about cleaner and better performing vehicles and engines.
Several programs have resulted in substancial emission reductions and health benefits. In fact, the emission reductions resulting from the clean fuel and vehicle standards finalized over the past several years will prevent more than 24,000 premature deaths, 19,000 hospitalizations and 3.2 million work days lost. When fully implemented in 2030, the annual bet benefits of these programs will be approximately $175 billion as compared with $11 billion in costs.
In addition to emissions that contribute to urban air pollution, the transportation sector accounts for 30% of US greenhouse gas emissions. EPA is working on solutions. For example, OTAQ'S automotive engineers are developing advanced technologies such as clean diesel combustion and hydraulic hybrids and are working with commercial partners to bring these hybrids to market. In addition, OTAQ'S voluntary initiatives are helping thousands of partners save billions of gallons of fuel - thus reducing carbon dioxide emissions - by implementing the best shipping and delivery practices and by encouraging employers to offer outstanding benefits.
http://www.fueleconomy.gov/feg//oildep.shtml (How oil dependence hurts our economy)
Only about 14% to 26% of the energy from the fuel you put in your tank gets used to move your car down the road, depending on the drive cycle. The rest of the energyis lost to engine and driveline inefficiencies or used to power accessories. Therefore, the potential to improve fuel efficiency is enormous. The following provides additional information and documentation.
http://www.fueleconomy.gov/feg/why.shtml (Why is fueleconomy important?)