Section 1090.270 - Gasoline oxygenate standards(a) All oxygenates designated for blending with gasoline or blended with gasoline must meet the following per-gallon standards:(1)Sulfur content. Maximum 10 ppm.(2)Chemical composition. Be composed solely of carbon, hydrogen, oxygen, nitrogen, and sulfur.(b) DFE designated for blending into gasoline or blended with gasoline must meet the following additional requirements:(1)Denaturant type. Only PCG, gasoline blendstocks, NGLs, or certified ethanol denaturant that meets the requirements in § 1090.275 may be used as denaturants.(2)Denaturant concentration. The concentration of all denaturants used in DFE must not exceed 3.0 volume percent.