Premium Gasoline

The last three years have seen historic changes in the U.S. octane market. The wholesale value of octane, the primary yardstick of gasoline quality and price, spiked threefold in 2022, followed by another year of high values in 2023. The numbers for 2024 and (so far) 2025 have been more stable, but still historically high. In today’s RBN blog, we look at why retail octane values have risen so high and why refiners have been capturing only a small share of the corresponding increase. 

Over the past five years, the price differential between regular and premium gasoline has been widening steadily.  According to the Energy Information Administration (EIA), as of July 2017 the premium -vs.-regular differential reached $0.53/gallon — more than double the differential in 2012. This has produced cringe-worthy experiences at the pump for consumers requiring the premium grade and an incentive for refiners to optimize the gasoline pool.  Consequently, refiners have been making operational adjustments and capital investments to squeeze additional high-octane components out of their feedstocks. Today we examine the premium-regular gasoline differential, provide a primer on gasoline blendstocks and octane levels, and discuss some contributing factors to the widening divide between the pump prices of 87- and 93-octane gasoline.

The U.S. refining industry appears to be transitioning from an era of high margins and record throughputs. Falling crude prices at first increased refining margins – especially as demand for cheap refined products like gasoline expanded. Now product inventories are brimming and margins are squeezed. As we explain today the industry can look forward to an extended period of low crude prices while regulatory requirements and the pace of economic growth largely drive refined product trends.