3.F: Texas

Texas fuel quality regulations encompass two conventional formulations but also include three areas that are subject to state (i.e. “boutique”) fuel formulations. Lastly, federal reformulated gasoline is mandated in the Houston/Galveston and Dallas Forth Worth metro areas due to ozone non-attainment status.

Per state regulations, the two conventional standards are required to meet ASTM D4814 Standard Specification for Spark-Ignition Engine Fuel, with the exception that ethanol blends are exempted from ASTM’s limits for temperature at which the vapor-liquid ratio equals 20 (T@V/L=20). In accordance with current Environmental Protection Agency (EPA) waivers, the 1-psi (6.9 kPa) waiver applies during the summertime (June 1 to September 15). The volatility limits applicable to the st