The AC Analytical Controls by PAC D5501 Ethanol Content of Denatured Fuel Ethanol application ensures complete compliance with ASMT D5501.  Ethanol is blended with gasoline to improve the efficiency of the combustion process, and reduce polluting emissions. Typically, the blend is 10% ethanol and 90% gasoline. AC Analytical Controls by PAC has developed the D5501 Ethanol Content of Denatured Fuel Ethanol application to ensure complete compliance with ASTM D5501.