As of August 2, 2021, regular retail gasoline prices in both the Rocky Mountain region (PADD 4) and the West Coast region (PADD 5) have been higher than the national gasoline price average, according to our Gasoline and Diesel Fuel Update. Among other factors, refinery closures in the West Coast and Rocky Mountain regions in the past year have reduced refinery output of gasoline, which in turn has lowered inventories and contributed to higher prices.