Current strict environmental legislation demands advanced concepts to reduce the emission of harmful gasses by cars. Reducing the emission of nitrous oxides (NOx) emitted by diesel and lean-burn petrol engines is one of the challenges faced.
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Alternative fuels are derrived from resources other than petroleum. Some are produced domestically, reducing our dependence on imported oil, and some are derived from renewable sources. Often, they produce less pollution than gasoline or diesel. 
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Here you'll find items of current interest — new programs, recent guidance, or timely reminders. Or jump to the latest news about IRS forms and publications.
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R-2006-182, Nov. 22, 2006 WASHINGTON — The Internal Revenue Service has acknowledged the certification by American Honda Motor Company, Inc., that its Honda Civic GX Model Year 2007 vehicle meets the requirements of the Alternative Motor Vehicle Credit.
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Alternative fuel vehicles placed into service before 2006 may be eligible for a one-time clean-fuel vehicle tax deduction of up to $2,000! Vehicles placed in service after 2005 may be eligible for a new energy tax credit of up to $3,400.
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Qualifying alternative fuel vehicles (AFVs) purchased or placed into service between January 1, 2005 and December 31, 2010 may be eligible for a federal income tax credit of up to $4,000.
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A tax deduction reduces the amount of income for which you are taxed. For example, if your taxable income were $50,000, a $2,000 deduction would reduce it to $48,000. So, you would pay taxes on an income of $48,000 instead of $50,000. This means your actual savings would be a fraction of the $2,000 deduction.
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Vehicle Requirements To be eligible for the tax credit, a vehicle must meet the following requirements:
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It is no accident that the most fuel efficient vehicles in some classes for this model year are hybrid-electric vehicles (HEVs). Hybrids combine the best features of the internal combustion engine with an electric motor, and they can be configured to achieve a variety of different objectives, such as improving fuel economy, boosting performance, or providing electrical power to auxiliary loads such as power tools.
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Four new hybrids are available for model year 2008:
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 Hybrid-electric vehicles (HEVs) combine the benefits of gasoline engines and electric motors and can be configured to obtain different objectives, such as improved fuel economy, increased power, or additional auxiliary power for electronic devices and power tools.
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The Tier 2 Vehicle and Gasoline Sulfur Program is a landmark program that affects every new passenger vehicle and every gallon of gasoline sold in the U.S. By designing cleaner cars that run on cleaner fuels the result is cleaner air. The program is a series of "firsts." For the first time:
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Oxygenates are fuel additives (alcohols and ethers) that contain oxygen which can boost gasoline's octane quality, enhance combustion, and reduce exhaust emissions. The term oxygenated gasoline most commonly refers to the wintertime program that reduces emissions of carbon monoxide (CO) from motor vehicles. Although required by the federal Clean Air Act, winter oxygenated gasoline programs are implemented by the states. This section provides information about oxygenated gasoline, winter oxygenated gasoline areas, oxygenates (such as ethanol and MTBE), and health effects testing of oxygenates.
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Volatility is the property of a liquid fuel that defines its evaporation characteristics. RVP is an abbreviation for "Reid vapor pressure," a common measure of gasoline volatility, as well as a generic term for gasoline volatility. EPA regulates the vapor pressure of all gasoline during the summer months (June 1 to September 15 at retail stations).
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EPA Actions that Help Ease the Impact of Gasoline Requirements on Fuel Supply Over the last several years EPA has implemented a number of actions and programs that significantly ease potential supply constraints that may have occurred as a result of clean fuel requirements. These actions and programs have provided the fuel supply and distribution industry increased flexibility to comply with the rules more cost-effectively, and in some cases, increase production; thus providing for a more reliable supply of fuel. In addition, EPA has partnered with the Department of Transportation to create Best Workplaces for Commuters, a program that aims to reduce the amount of vehicle miles traveled (VMT)- thus easing existing demand on supplies.
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EPA has changed the way it estimates MPG. Starting in model year 2008, estimates will reflect the effects of
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 Manufacturers do not test every new vehicle offered for sale. They are only required to test one representative vehicle—typically a preproduction prototype—for each combination of loaded vehicle weight class, transmission class, and basic engine.
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 A hose is connected to the tailpipe to collect the engine exhaust.
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 Each schedule specifies the speed the vehicle must travel during each second in the test.
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