Jump to main content.
Related Links
Related EPA Content
- Oxygenates/MTBE
Oxygenates (such as ethanol and MTBE) are fuel additives containing oxygen, which boost gasoline's octane quality, enhance combustion, and reduce exhaust emissions.
- MTBE
MTBE has been used in U.S. gasoline at low levels since 1979 to replace lead as an octane enhancer. Since 1992, MTBE has been used at higher concentrations in some gasoline to fulfill the oxygenate requirements set by Congress in the 1990 Clean Air Act Amendments.
- Tier 2 Vehicle and Gasoline Sulfur Program
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.
- State and Local Clean Fuel Requirements ("Boutique" Fuels)
The gasoline requirements in the Clean Air Act take precedence in all states, except under certain circumstances where the Act allows states to implement their own clean fuel programs with EPA.
- Volatility (RVP)
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.
- Alternative Fuels
EPA promotes and expands the use of environmentally beneficial alternative fuels and vehicles by providing the states with tools, such as benefits models, State Implementation Plan Credits, and the Clean Fuels Fleet program.
External Links 
Jump to main content.
![[logo] US EPA](https://webarchive.library.unt.edu/eot2008/20081028085836im_/http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}