1.1&# This specification covers formulating specifications for purchases of aviation gasoline under contract and is intended primarily for use by purchasing agencies. 1.2&# This specification defines specific types of aviation gasolines for civil use. It does not include all gasolines satisfactory for reciprocating aviation engines. Certain equipment or conditions of use may permit a wider, or require a narrower, range of characteristics than is shown by this specification. 1.3&# The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.