Where Every Dollar You Spend on Gas Actually Goes

Crude oil: about half, and not negotiable

The single biggest component of what you pay is the raw material, and nobody in your state has any say over it. Crude trades on a world market. A barrel is a barrel whether it comes out of the Permian Basin or the North Sea, and the price is set by global supply and demand, by OPEC decisions, and lately by whether ships can get through the Strait of Hormuz.

There is a piece of arithmetic worth knowing, because it lets you forecast the sign on your corner. A barrel holds 42 gallons. Divide a one dollar move in crude across 42 gallons and you get about 2.4 cents a gallon. So when crude jumps twenty dollars, something close to fifty cents a gallon follows within a few weeks. That is not a rule of thumb somebody estimated - it is just long division, which is why it holds up so well.

This is also why gas prices rise faster than they fall, or at least feel that way. Stations buy their fuel days or weeks before they sell it. When wholesale costs jump, the station is protecting a margin on inventory it has already paid more for. When costs drop, there is less urgency.

Refining: the slice that swings hardest

Refining turns crude into gasoline, and the cost of doing it is far less stable than people assume. In 2025 it was 14.3% of the pump price. In May 2026 it was 22%. That is a huge move in a component most drivers never think about.

Several things drive it. Summer and winter gasoline are different products with different vapour pressures, and the summer blend costs more to make. Different regions mandate different formulations, which fragments the market and means a refinery outage in one place cannot always be covered from another.

Geography does the rest. The Gulf Coast holds more than half of all US refining capacity, and Gulf Coast pump prices are reliably the lowest in the country. The West Coast has the opposite problem - shrinking refinery capacity, limited pipeline connections to other refining centres, and fuel specifications that are more expensive to produce. In mid-May 2026 the EIA had West Coast prices averaging $5.61 a gallon against $3.95 on the Gulf Coast. That gap of more than a dollar and a half is mostly refining and logistics, not tax.

The margin between what a refiner pays for crude and what it gets for the finished products has a name - the crack spread - and it is the number that tells you whether refining is the problem in any given month. When you see pump prices rising faster than crude, that is usually where to look.

Distribution and marketing: the least glamorous 18 cents on the dollar

Getting the finished fuel from the refinery to your tank costs more than refining it did. Pipelines, marine shipping, rail, terminal storage, and finally a tanker truck driving to a specific station. Layered on top is the station's own margin, the brand licensing, and the cost of running a retail business.

Station margins are thinner than most people believe. The fuel is often close to a loss leader; the money is inside, in coffee and snacks and lottery tickets. That is why the price boards compete so aggressively for a penny or two, and why a station with no convenience store attached usually is not cheaper.

Taxes: the part that shrinks when prices rise

Now the slice everybody has an opinion about, and the one that behaves in the opposite way to how it is usually described.

Fuel taxes in the United States are, overwhelmingly, fixed amounts per gallon. Not percentages. The federal excise is 18.4 cents on every gallon of gasoline and 24.4 cents on diesel, and it is the same 18.4 cents whether the pump price is two dollars or five. Most state taxes work the same way.

The consequence is arithmetic. When gasoline is cheap, taxes are a large share of a small number. When gasoline is expensive, taxes are the same number of cents but a smaller share.

The EIA's own annual series shows it cleanly. Over the 2014 to 2023 decade, gasoline averaged $2.83 and taxes were 17.3% of the price. In 2023 by itself, gasoline averaged $3.52 and taxes were 14.4%. Over 2016 to 2025, at $2.89, taxes were 17.4%; in 2025 alone, at $3.10, 16.6%. Every time the price goes up, the tax share goes down, without a single legislature doing anything.

The 2026 spike pushed it further in the same direction. Monthly breakdowns reported for the spring of 2026, with gasoline well above four dollars, put the tax share nearer 12 to 14%.

None of which makes the tax small in absolute terms, and none of which is an argument about whether it should be higher or lower. But it does mean that a gas tax holiday during a price spike is cutting the smallest of the four slices at the moment it is already at its least significant - which is one of the reasons economists are so consistently unenthusiastic about them.

The federal 18.4 cents has not moved since 1993

That date is worth sitting with. The federal fuel excise was last raised on October 1, 1993, when the national average pump price was $1.11 a gallon. The Omnibus Budget Reconciliation Act added 4.3 cents that year, taking the rate from 14.1 cents to 18.4, and there it has stayed. It is not indexed to inflation, to construction costs, or to anything else. A nominal 18.4 cents in 1993 and a nominal 18.4 cents today are the same number and emphatically not the same amount of money.

In 1993 that 18.4 cents was about a sixth of the pump price. Today it is closer to a twenty-fifth of it.

This is the slow-motion crisis underneath American road funding. The tax was designed as a user fee - drivers pay for the roads they use. But the fee has been frozen for more than three decades while asphalt, labour and steel have not been. Fuel efficiency has improved steadily, so each mile driven generates less revenue. And electric vehicles use the roads while paying no fuel tax at all.

States have been patching around it. Most now charge an additional registration fee on electric vehicles to recover some of the lost revenue, and a growing number are examining vehicle miles travelled taxes that would charge by the mile instead of by the gallon. That is the direction of travel, and it is being forced by a rate that has not been touched since the first Clinton administration.

The one slice your state controls

Everything above is roughly the same wherever you fill up. The tax band is not. As of July 2026, state gasoline taxes ran from 8.95 cents a gallon in Alaska to 73.64 cents in California - a ratio of about eight to one.

Put that in terms of a tank. On a fifteen gallon fill, the state tax alone is about $11.05 in California and about $1.34 in Alaska. Over a year at five hundred gallons - a fairly ordinary amount of driving - that is roughly $368 against roughly $45. Same car, same fuel, same world crude price. A difference of three hundred dollars a year decided entirely by which side of a state line you live on.

Alaska's rate is the one that surprises people. Its base motor fuel tax has sat at 8 cents a gallon for decades - it was 8 cents in 1993 and still 8 cents in 2014 - with a small refined fuel surcharge added later to bring the total to 8.95. The state funds its roads largely through other means. It is also a reminder that a low gas tax does not mean cheap gas: Alaska's pump prices are among the highest in the country, because getting fuel there costs a fortune.

Why nobody can agree on which state is highest

If you go looking for this data yourself you will find sources that flatly contradict each other. One will tell you California is highest at 73.6 cents. Another says California is at 70.9. A third names Pennsylvania. They are all, in their own terms, correct, and the disagreement is the most interesting thing in this entire article.

The problem is that there is no single thing called a gas tax. There is a stack of things, and different compilers draw the line in different places. They also sample on different dates - the EIA publishes its state tax table twice a year, in January and June, while other compilations run to July, and several states change their rates on January 1 or July 1. Two perfectly careful sources can disagree simply because one caught a rate change and the other did not.

That last row is where the numbers get wild. California's Legislative Analyst's Office puts the cap-and-trade effect at about 23 cents a gallon. For the Low Carbon Fuel Standard, the Air Resources Board had previously projected 52 cents for 2026 while the Energy Commission more recently estimated 19. Add the programs to the direct taxes and the total burden in California comes to roughly $1.156 a gallon - well over a dollar before a single drop of crude is paid for.

Washington tells a similar story with similar disagreement. Its Climate Commitment Act was originally expected to add around 44 cents; the Department of Ecology now puts the clean fuel standard at 7.2 cents and the cap-and-invest program somewhere between 5.16 and 15.5 cents. Oregon's Clean Fuels Program was estimated at about 9.35 cents in 2025. New Mexico began its own program in April 2026.

So when someone tells you their state has the highest gas taxes in the country, the honest answer is: on which measure? It is not a dodge. It is the actual state of the data.

What changed this year

State rates are not static, and 2026 saw more movement than usual. Indiana went up 8.6 cents, lifting it from fifth to third highest, partly because its tax is price-based and gasoline got more expensive. Michigan added 5.2 cents, New Jersey 4.2, Illinois 4, Vermont 3.5, Mississippi 3, California 2.7, Washington 1.1, and Colorado added a cent to its road usage fee.

Utah went the other way, cutting 6.6 cents and dropping from fourteenth to twenty-third.

Indiana is the one to watch, because it illustrates something the rest of this article has been circling. Most states charge a flat amount per gallon, which means their revenue erodes as inflation runs and fuel economy improves. Indiana's is partly tied to the price, so when crude spiked, Indiana's tax take rose automatically. That is either sensible indexation or a tax increase without a vote, depending entirely on where you sit.