What is gasoline? Gasoline is a refined petroleum product made up of hundreds of volatile hydrocarbons, typically containing four to twelve carbon atoms per molecule, and it remains the dominant fuel for spark-ignition engines worldwide. Roughly 26.8 million barrels of it are produced globally each day in 2026, with the United States alone accounting for over a third of that output. For terminal operators and procurement teams asking what gasoline actually is from a handling standpoint, the answer is as much about storage infrastructure as chemistry.
Unlike crude oil, gasoline is not extracted from the ground. It is manufactured at refineries through a sequence of processing steps that convert heavier crude fractions into a lighter, high-octane blend suited to combustion engines.
What Is Gasoline Made Of and How Is It Produced?
Production begins with fractional distillation, where crude oil is heated inside a distillation tower and separated into fractions by boiling point. Lighter fractions, including naphtha and gasoline components, rise to the top of the tower and are drawn off first.
Because straight-run naphtha alone has too low an octane rating for modern engines, refineries apply catalytic cracking to break heavier molecules into smaller, gasoline-range fragments. A further reforming and blending stage adds detergents, corrosion inhibitors, and oxygenates such as ethanol to meet performance and environmental specifications before the finished product leaves the refinery gate.
Understanding Octane Ratings
The number on a fuel pump, commonly 87, 91, or 95, reflects the octane rating: a measure of how resistant the fuel is to premature ignition, or knocking, inside the engine cylinder. Higher-compression and turbocharged engines generally require higher-octane fuel to operate safely.
Octane ratings vary by region. European markets typically centre on 95 RON as standard unleaded, with 98 RON sold as a premium option, while the US market uses the Anti-Knock Index, placing regular grade around 87 AKI.
What Is Gasoline’s Role in Global Refining and Storage?
Gasoline production is concentrated in regions with advanced refining capacity rather than crude-producing regions alone. The US Gulf Coast, centred on Texas and Louisiana, hosts some of the most complex refining infrastructure in the world, purpose-built to maximise high-octane gasoline yield from each barrel. Valero Energy operates a significant share of that Gulf Coast refining base.
Storage handling is shaped by gasoline’s volatility. Floating roof tanks are the standard for bulk gasoline storage, with the roof resting directly on the liquid surface to eliminate vapour space and reduce evaporation and fire risk. Fixed cone roof tanks paired with vapour recovery units offer an alternative, capturing escaping vapour and condensing it back into liquid product. For more detail on tank design and regulatory requirements, see Floating Roof Tanks: Types, Operations & Regulations.
Retail-side storage relies on double-walled underground tanks fitted with interstitial leak sensors, while transport between refineries and terminals uses baffled tank trucks, insulated rail tank cars, and double-hulled product tankers fitted with inert gas systems to eliminate explosion risk during marine transit.
Why Does Gasoline Pricing Move the Way It Does?
Gasoline pricing tracks crude oil costs closely but is also shaped independently by refining capacity, seasonal blend requirements, and regional tax structures. Summer-grade gasoline is formulated with lower vapour pressure to limit evaporation and smog formation in warm weather, while winter-grade blends use higher vapour pressure to support cold-start performance, and refineries switch between the two on a seasonal cycle that terminal operators must plan storage turnover around.
Current benchmark pricing, regional breakdowns, and unit conversions are tracked separately on OGSN’s Gasoline Price Today page, updated monthly. For official US production and price data, OGSN references the U.S. Energy Information Administration’s petroleum statistics.
Safety and Handling Considerations
Gasoline has a flash point as low as −43°C, making it flammable across a wide ambient temperature range, and its vapour mixes and spreads rapidly once released into open air. The explosive range sits between roughly 1.4 and 7.6 percent concentration by volume in air, a margin that storage and transport equipment is specifically engineered to stay clear of through vapour containment and ignition-source control.
Beyond fire risk, gasoline contains regulated contaminants including benzene and toluene, which is why underground storage tanks at retail sites are required to carry continuous leak monitoring to prevent groundwater contamination. Understanding what gasoline requires in terms of containment and monitoring is a core part of terminal compliance.
What is gasoline made of?
Gasoline is a complex mixture of hydrocarbons with four to twelve carbon atoms per molecule, produced through fractional distillation and catalytic cracking of crude oil, then blended with additives such as detergents and oxygenates.
What is the difference between gasoline and diesel?
Gasoline is used in spark-ignition engines and is lighter and more volatile, while diesel is used in compression-ignition engines and has a higher energy density per litre. The two require different refining streams and different storage tank specifications.
How is gasoline stored at terminals?
Bulk gasoline is typically stored in floating roof tanks, which eliminate vapour space above the liquid to reduce evaporation and fire risk, or in fixed cone roof tanks paired with vapour recovery units.
What does the octane rating on gasoline mean?
The octane rating measures a fuel’s resistance to knocking, or premature ignition, inside an engine cylinder. Higher-octane fuel allows for higher compression ratios without engine damage.
Where can I find the current gasoline price?
OGSN tracks the live gasoline price across US, UK, and global benchmarks, updated monthly with storage economics context.