Liquefied natural gas and oil are both fossil hydrocarbons, but they are not really competitors in the way the question implies. Oil is refined into the liquid fuels that move the world's vehicles, ships, and aircraft; natural gas and LNG mostly make electricity, heat buildings, run factories, and feed the chemical industry. Where the two genuinely intersect is in pricing — where LNG was historically tied to the oil price — and at the energy transition's edges, where gas is starting to displace oil in shipping and heavy transport. This page compares the two across the dimensions that actually matter.
Two fuels, two different markets
The first thing to understand is that LNG and oil rarely fight over the same customers. Crude oil is a feedstock for refineries, which split it into a slate of products: diesel and petrol for road transport, jet fuel for aviation, heavy fuel oil for ships, plus lubricants, bitumen, and petrochemical naphtha. Liquid fuels are energy-dense and easy to carry, so they have an almost unbreakable grip on transport.
Natural gas — whether delivered by pipeline or shipped as LNG — flows mostly to fixed installations. Its dominant uses are power generation, space and process heating, industrial steam, and as a feedstock for ammonia, methanol, and hydrogen. See the main uses of natural gas and LNG for the full breakdown. Because the demand sits in such different places, a fall in the oil price does little to dent gas demand directly, and vice versa.
How LNG and oil compare
The table below lays out the main contrasts. The figures are approximate ranges, since exact values depend on the specific product, contract, and conditions.
| Dimension | LNG (natural gas) | Oil (crude & products) |
|---|---|---|
| Primary uses | Power generation, heating, industry, chemical feedstock | Transport fuels (diesel, petrol, jet, fuel oil); petrochemicals |
| Energy density (per litre) | Lower; needs cryogenic storage at -162°C | Higher; liquid at ambient temperature and pressure |
| Transport & storage | Cryogenic ships and tanks, or pipelines as gas | Conventional tankers, drums, and tanks; simpler handling |
| Pricing basis | Historically oil-indexed in Asia; shifting to gas hubs (Henry Hub, JKM, TTF) | Crude benchmarks (Brent, WTI) plus refining margins |
| Combustion emissions | Lower CO₂; far less sulphur and particulates | Higher CO₂ per unit energy; more SOₓ and soot |
Energy density: why oil still rules transport
One of the clearest practical differences is how much energy each fuel packs into a given volume. Crude oil and its refined products carry more energy per litre than LNG, and — crucially — they are liquid at ordinary temperature and pressure. A diesel tank is just a sealed steel box.
LNG, by contrast, is only a liquid because it has been chilled to about -162°C. Keeping it cold demands insulated cryogenic tanks, and even then a little evaporates as boil-off gas. Combined with its lower volumetric energy content, this makes LNG bulkier and more complex to store and refuel on a moving vehicle. That is the core reason oil-derived fuels still dominate cars, trucks, ships, and planes: they deliver more range from less space, with far simpler equipment.
Pricing: the long shadow of oil indexation
For decades the most important link between gas and oil was financial rather than physical. When the Asian LNG trade was being built, there was no liquid gas market to set a reference price, so buyers and sellers borrowed the one that already existed: crude oil.
Long-term Asian LNG contracts were therefore oil-indexed. The gas price was written as a percentage — a "slope" — of a crude benchmark such as Brent or the Japan Crude Cocktail (JCC), often with a constant added. Slopes commonly cited sit in the low-to-mid-teens percent of the oil price; a 14% slope against, say, an $80 crude price implies a gas price in the region of $11 per million BTU. For more on these mechanics see the guide to LNG pricing.
That model is steadily giving way to gas-on-gas pricing, in which LNG is priced off dedicated gas benchmarks: Henry Hub in the United States, the Japan Korea Marker (JKM) in Asia, and the Title Transfer Facility (TTF) in Europe. As these hubs have grown more liquid, the rationale for borrowing the oil price has weakened, and an increasing share of cargoes — especially flexible US volumes — now trade on gas indices. Oil indexation has not vanished, but its share has fallen and the gas market increasingly sets its own price.
Emissions and air quality
At the point of combustion, natural gas is the cleaner fuel. Burning it emits roughly 25-40% less CO₂ per unit of energy than oil products, because methane has a higher hydrogen-to-carbon ratio. Gas also produces far less sulphur dioxide and particulate matter, which matters for local air quality as much as for climate.
Two caveats keep this from being a clean win. First, the advantage is measured at the burner; across the full life cycle, upstream methane leakage can erode part of the climate benefit, since methane is a potent greenhouse gas. Second, the comparison is per unit of energy, not per use — gas does not simply substitute for oil in most applications. For a deeper treatment of the carbon question, the LNG vs. coal comparison covers the same trade-offs against the dirtier end of the spectrum.
Where they actually compete
Because their core markets barely overlap, LNG challenges oil only at the margins — but those margins are growing:
- Marine bunker fuel: tightening limits on sulphur emissions from ships have pushed some operators from heavy fuel oil toward LNG, which burns cleaner and helps meet air-quality rules.
- Heavy trucking: in a few markets, LNG-fuelled long-haul trucks compete with diesel where gas is cheap and refuelling infrastructure exists.
- Power and industry in oil-reliant systems: some economies still burn oil products for electricity or heat, and switching them to gas cuts both cost and emissions.
Outside these niches, the two remain complementary rather than rival fuels: oil moves things, gas powers and heats them.
Frequently asked questions
Are LNG and oil used for the same things?
Mostly not. Crude oil is refined into liquid fuels — diesel, petrol, jet fuel, fuel oil — and dominates transport. Natural gas and LNG are used mainly for power generation, heating, industry, and as a chemical feedstock. The two compete only at the margins, such as in marine bunkering and some heavy trucking.
What does it mean for LNG to be oil-indexed?
Historically, many long-term LNG contracts in Asia set the gas price as a percentage — a slope — of a crude oil benchmark such as Brent or the Japan Crude Cocktail. Slopes commonly cited fall in the low-to-mid teens percent of the oil price. The market has since been shifting toward gas-on-gas pricing linked to hubs like Henry Hub, JKM, and TTF.
Which has higher energy density, oil or LNG?
Crude oil and refined products carry more energy per litre than LNG and are liquid at ambient temperature and pressure, so they need no cryogenic tanks. That higher volumetric energy density and easier handling are key reasons oil still dominates transport fuels.
Does burning gas produce fewer emissions than oil?
Yes. Burning natural gas emits roughly 25-40% less CO₂ per unit of energy than oil products, and far less sulphur and particulate matter. This emissions and air-quality advantage is why LNG is promoted as a marine bunker fuel, though upstream methane leakage can erode part of the climate benefit.