Designation:D4814−22StandardSpecificationforAutomotiveSpark-IgnitionEngineFuel1ThisstandardisissuedunderthefixeddesignationD4814;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverstheestablishmentofrequire-mentsofliquidautomotivefuelsforgroundvehiclesequippedwithspark-ignitionengines.1.2Thisspecificationdescribesvariouscharacteristicsofautomotivefuelsforuseoverawiderangeofoperatingconditions.Itprovidesforavariationofthevolatilityandwatertoleranceofautomotivefuelinaccordancewithseasonalclimaticchangesatthelocalitywherethefuelisused.FortheperiodMay1throughSeptember15,themaximumvaporpressurelimitsissuedbytheUnitedStates(U.S.)Environmen-talProtectionAgency(EPA)arespecifiedforeachgeographi-calareaexceptAlaska,Hawaii,andtheU.S.Territories.VariationoftheantiknockindexwithseasonalclimaticchangesandaltitudeisdiscussedinAppendixX1.Thisspecificationneithernecessarilyincludesalltypesoffuelsthataresatisfactoryforautomotivevehicles,nornecessarilyex-cludesfuelsthatcanperformunsatisfactorilyundercertainoperatingconditionsorincertainequipment.ThesignificanceofeachofthepropertiesofthisspecificationisshowninAppendixX1.1.3Thespark-ignitionenginefuelscoveredinthisspecifi-cationaregasolineanditsblendswithoxygenates,suchasalcoholsandethersandwheregasolineistheprimarycompo-nentbyvolumeintheblend.Theconcentrationsandtypesofoxygenatesarenotspecificallylimitedinthisspecification.Thecompositionofbothunleadedandleadedfuelislimitedbyeconomic,legal,andtechnicalconsideration,buttheirproperties,includingvolatility,aredefinedbythisspecifica-tion.Inmanycountries,regulatoryauthoritieshavingjurisdic-tionhavesetlawsandregulationsthatlimittheconcentrationofoxygenatesandcertainothercompoundsfoun...
