The proposed rule includes updating adopted ASTM International quality specifications for motor fuels; eliminating individualized volatility specifications for gasoline/ethanol blends as they are now incorporated into ASTM International specifications, which are adopted in rule; allowing provisions for base fuels to not meet selected specifications before blending, but require them to meet those specifications after blending with ethanol; amending maximum vapor pressure requirements for gasoline products sold in selected Florida counties to be consistent with changes being made by the Florida Department of Environmental Protection and the Environmental Protection Agency; updating rule sections to reflect current versions of referenced Department forms; adopting specifications for compressed natural gas (CNG) and liquefied natural gas (LNG) when used as motor fuels; adopting blending specifications for gasoline-ethanol blends containing between 10 and 15 percent ethanol; and adopting quality specifications for gasoline blended with butanol.