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U . S . Department of Energy - Energy Efficiency and Renewable Entergy Alternative Fuels Data Center E85 Specification ASTM International developed a specification for gasoline-ethanol blends containing 51 % -836/o ethanol to ensure proper vehicle starting , operation , and safety in varying temperature conditions . The table below shows the requirements of the ASTM D5798 ' *— , Standard Specification for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark-Ic,Lnition Engines (htti) : //www. astm . org/Standards/ D5798 , htm ) , Fuel retailers or fleets purchasing E85 should require their fuels to meet quality standards as a condition in their supply contracts in order to help guarantee their product 's Ashy'-compliant . Like gasoline and diesel fuel , E85 and other ethanol-gasoline blends are adjusted seasonally and geographically to ensure proper starting and performance . For example , E85 sold during colder months often contains lower levels of ethanol to produce the vapor pressure necessary for starting In cold temperatures . For this reason , fueling site operators offering ethanol blends typically cannot carry over summer-blend E85 into the winter months . They must instead " blend down" any remaining summer fuel to meet the ASTM specification's requirements for winter temperature conditions . This can be done with relative ease by adding additional gasoline to the storage tank . On the other hand , there is no concern with carrying over winter fuel into the summer months because flexible-fuel vehicles can operate on any blend of ethanol and gasoline in warm weather. For retail stations , seasonal fuel adjustments are handled automatically at the wholesale fuel terminal . Refer to the Handbook for Handling , Storing,, gnd Dispensing E85 and Other Ethanol�Gasoline Blends (/uploads/publication/ethanol handbook . p_df) for local seasonal blending requirements . D5798 .11 Standard Specification for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark-ignition Engines Property ASTM Method Class 1 Class 2 Class 3 1 Class 4 Vapor Pressure , psi D5191 5. 5-9 . 0 7 . 0-9. 5 8. 5-12. 0 9 . 5-15. 0 Ethanol Content , vol % D5501 51 -83 Methanol , vol % D5501 0 . 5 , maximum Higher Alcohols , vol % D5501 2, maximum Sulfur, ppmw D5453 807 maximum Acidity, mass % D1613 0. 005 , maximum Washed gum , mg/ 100mL D381 52 maximum Unwashed gum , mg/ 100mL D381 20 , maximum pHe D6423 6. 5-9. 0 IF IF Inorganic Chloride , ppmw D7328 17 maximum Water, mass % E203 1 . 0, maximum Inorganic Sulfate , ppmw D7328 No Limit Potential Sulfate , ppmw D7328 No Limit The AFDC is a resource of the U . S. Department of Energy's Clean Cities (https:/ldeancitles. energy.gov/) program. Contacts (/contacts. html) I Web Site Policies ( liUp://www. eGre .energy.govlwebpoliciest) I U .S. Department of Energy ( http://www. energy.gov/) I USA. gov (http ://www. usa.gov/) Content fast Updated : 03/30/2016