From:
http://www.azdwm.gov/business/CBG%20main.htm
Where Does Our Fuel Come From?
Arizona receives all of its gasoline from two main sources:
* the West pipeline suppliers (predominately Southern California refiners), and
* the East pipeline suppliers (predominately Gulf Coast refiners).
The West pipeline, the larger of the two, runs from Southern California to Yuma and then to Phoenix, through which product is in transport for 6 to 7 days! The East pipeline runs from El Paso, Texas, to Tucson and then to Phoenix, where transport time is slightly less than that of the West pipeline. Of the approximately 1.5 billion gallons of Arizona CBG that are piped or transported to and consumed within the CBG Covered Area each year, roughly 57 percent comes from the West pipeline and 43 percent comes from the East pipeline.