### Question
How does Clean Fuel Vehicles define base gasoline?


### Answer
Under *42 U.S.C. § 7581*, **base gasoline** is defined as:

> gasoline which meets the following specifications:


  


  Specifications of Base Gasoline Used
    as Basis for Reactivity Readjustment:
 API gravity57.8 
 Sulfur, ppm317  
 ColorPurple
 Benzene, vol. %1.35
 Reid vapor pressure8.7 
 Drivability1195  
 Antiknock index87.3 
  Distillation, D–86 °F
 IBP92  
 10%126  
 50%219  
 90%327  
 EP414  
  Hydrocarbon Type, Vol. % FIA:
 Aromatics30.9 
 Olefins8.2 
 Saturates60.9   



        


The Administrator shall modify the definitions of NMOG, base gasoline, and the methods for making reactivity adjustments, to conform to the definitions and method used in California under the Low-Emission Vehicle and Clean Fuel Regulations of the California Air Resources Board, so long as the California definitions are, in the aggregate, at least as protective of public health and welfare as the definitions in this section

#### Citation:
  - *42 U.S.C. § 7581*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER II-EMISSION STANDARDS FOR MOVING SOURCES > Part C-Clean Fuel Vehicles**

