You are here: U.S.: overview of gasoline specifications in PADD 5 statesPart 3: State Gasoline Quality Regulations in PADD 5 (Lower 49 states)3.A: Arizona
3.A: Arizona
Arizona features two conventional gasoline formulations that make reference to ASTM D4814 Standard Specification for Spark-Ignition Engine Fuel but introduce extensive modifications. The formulations follow the geographical boundaries established by the two separate ASTM sets of volatility limits for Arizona, i.e. one for the state’s northeastern quadrant and one for the remainder of the state. Differences between these two standards are summarized in Fig. 1.
Three elements unique to Arizona’s conventional gasolines are:
    •The inclusion of maximum values for aromatics and olefins (50 %vol and 25 %vol, respectively) that are not featured in ASTM D4814 and are generally relevant only in an RFG context
    •Some distillation temperatures remain constant over the course of the year (e.g.
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3.A: Arizona