What You Pay for in a Gallon of Gasoline

The number on the station sign looks like one price. It is really four prices added together. Every gallon of regular gasoline carries a charge for the crude oil it came from, a charge for refining that crude into fuel, a charge for moving and selling the fuel, and a layer of taxes. The U.S. Energy Information Administration (EIA) publishes this split every month in its Gasoline and Diesel Fuel Update, and it is the most useful way to understand why pump prices move: each of the four slices is set by a different market, on a different schedule, for different reasons. When the sign jumps 30 cents, the right first question is never "why did gas go up?" It is "which of the four slices just moved?"

This guide takes the stack apart slice by slice. It shows the EIA's most recent published mix, works a real gallon from the week ending September 25, 2026 using this site's own EIA price export (the same data behind our markets page and WTI price page), and explains why two cities can sit more than two dollars apart in the same week while buying fuel made from the same global crude market. Two companion guides go deeper on the moving parts: the crack spreads guide covers the refining slice as a traded margin, and the rockets and feathers guide covers why the whole stack rises faster than it falls. This page is about the stack itself - what is in it, and how to read it.

1. The short answer: four slices, one sign

The EIA's framework has four components, and it has used the same four for decades, which makes the series a clean way to watch the structure of the price change over time:

• Crude oil. The cost of the raw barrel, priced in global markets. Usually the largest slice and by far the most volatile.
• Refining. The cost and margin of turning crude into gasoline and the rest of the product barrel. Moves with refinery outages, maintenance seasons, fuel specifications, and how tight product supply is.
• Distribution and marketing. Pipelines, terminals, tanker trucks, wholesale margins, and the station itself. The smallest slice, and the most local.
• Taxes. Federal, state, and in places local per-gallon charges. The most stable slice: tax rates change by legislation, not by market mood.

In the EIA's monthly pump-price breakdown for January 2026, the national average gallon split roughly as follows: crude oil about 51 percent, refining about 20 percent, distribution and marketing about 11 percent, and taxes about 18 percent. Treat those shares as a snapshot, not a law. The EIA republishes the mix monthly precisely because it moves: when crude spikes, the crude share can climb past 60 percent; when crude falls back, the other three slices - which mostly move in cents, not in proportion to crude - automatically become larger shares of a smaller total. That one mechanical fact explains a common confusion at the pump. A driver can hear that crude "collapsed" while the pump price only eases, because crude was never the whole price to begin with. Roughly half of it was something else.

Shares are the EIA's monthly pump-component estimates for the national average regular gallon, January 2026, as published in the Gasoline and Diesel Fuel Update series. Shares are rounded and move monthly; the table describes structure, not today's exact price in any city.

2. Slice one: crude oil, the half that swings

Crude is the input, and it is priced before anyone in the fuel chain touches it. The arithmetic that connects a headline barrel price to a gallon at the pump is the simplest in this guide: a standard barrel holds 42 gallons, so the crude cost carried into each gallon of refined product is the barrel price divided by 42. In the week ending September 25, 2026, WTI crude averaged $93.57 a barrel in this site's EIA weekly price export. Divide by 42 and the crude slice is about $2.23 a gallon. Brent, the waterborne benchmark, averaged $117.08 that same week - about $2.79 a gallon on the same arithmetic - which is one reason seaborne and import-dependent markets felt that week more sharply than inland ones. The benchmark gap itself is its own subject, covered in our WTI versus Brent spread guide.

Two cautions keep that arithmetic honest. First, a refinery does not turn a barrel of crude into 42 gallons of gasoline. It produces a slate - gasoline, diesel, jet fuel, heating oil, and more - so the $2.23 is the crude cost shared across each gallon of product, not a recipe for one gallon of gasoline. The EIA's accounting assigns the crude cost this way because it is the cleanest way to compare the input against the outputs. Second, the crude a given refinery buys may be priced off WTI, Brent, or a regional grade at a discount or premium, and it was often bought weeks before the fuel reaches a station. The $2.23 is therefore best read as the current replacement cost of the crude in the supply chain - the number the whole chain is repricing against - rather than the exact historical cost of the molecules in any one tank.

What moves this slice is the global crude balance: production decisions by the exporting group covered in our OPEC+ explainer, U.S. shale output and drilling activity on our rig counts page, inventory levels in the weekly report explained in our guide to reading the EIA weekly petroleum report, and demand on the other side of the ledger. Because it is roughly half the pump price and trades every day, crude is where most of the drama lives. A $10 move in the barrel is about 24 cents a gallon of crude cost ($10 divided by 42), before any other slice reacts. That single conversion - barrel move divided by 42 - is the fastest sanity check in fuel economics. If crude fell $10 and the pump fell 5 cents, the missing 19 cents went somewhere in the other three slices, and the rest of this guide is about finding out where.

3. Slice two: refining, the margin that can outrun crude

Refining is where crude stops being a commodity input and becomes a set of products people can actually burn. The refiner buys the barrel, runs it through distillation and conversion units, and sells gasoline, diesel, jet fuel, and the rest. The difference between what the products sell for and what the crude cost - the crack spread - is the market's running estimate of the refining slice. It is quoted per barrel, and dividing by 42 puts it on the same per-gallon footing as everything else in this guide. In late September 2026, this site's futures book put the gasoline crack near $48.80 a barrel, about $1.16 a gallon. Set that beside the $2.23 crude slice from the same stretch of data and the structure of the moment becomes clear: the refining slice was running at roughly half the size of the crude slice itself, far wider than in a calm market, and fully capable of moving the pump price on days when crude sat still.

The wholesale prints tell the same story from the other side. New York Harbor wholesale gasoline averaged $3.58 a gallon in the week ending September 25, 2026, in the site's EIA export. Subtract the $2.23 crude slice and about $1.35 a gallon sits between the crude input and the wholesale product - the space in which refining value, blending components, and wholesale handling all live. That gap is not pure refiner profit: it has to cover energy to run the plant, catalysts and maintenance, compliance with fuel specifications, and blending in components such as ethanol before a gallon is even shippable. What is left after those costs is the margin the crack spread is really tracking, which is why the crack spreads guide insists on reading the spread as a gross margin signal, not a profit figure.

Three forces widen or narrow this slice. The first is capacity in use: U.S. refineries ran at 92.5 percent of capacity in that same late-September week, with about 16.67 million barrels a day of crude going into the system. High utilization leaves little slack, so an unplanned outage anywhere in a region tightens product supply quickly. The second is the calendar. Refineries shut units for planned maintenance in the slower shoulder seasons, and they switch between winter and summer gasoline blends on a regulatory schedule; the spring changeover to summer-grade fuel, which costs more to make, is a recurring reason pump prices firm up even in a quiet crude market. The third is product stocks: motor gasoline supplied - the EIA's demand proxy - ran about 8.69 million barrels a day that week, and when weekly draws in the inventory analysis show product leaving tanks faster than refineries refill them, wholesale buyers bid the refining slice up. None of these three needs crude to move at all. That independence is exactly why "oil is down, why is gas up?" is usually a refining question wearing a crude costume.

4. Slice three: distribution and marketing, the local layer

Once gasoline exists, it still has to get to a corner someone drives past. It moves by pipeline to regional terminals, sits in storage, loads into tanker trucks, and arrives at a station that may be ten minutes or several hours from the terminal. Every hand in that chain - pipeline, terminal, wholesaler, hauler, station - takes a small part of the distribution and marketing slice, which the EIA put at about 11 percent of the national price in January 2026, the smallest of the four. Small does not mean uniform. A station beside a terminal in a cluster of competing stations lives in a different cost world from a lone station at the end of a long haul, and the slice reflects it.

This is also the slice where the romance about station profits goes to die. The station owner does not see 11 percent of the pump price as income. The station's portion of the slice has to pay for the truck that delivered the fuel, the electricity and upkeep of pumps and tanks, labor, rent or land costs, and the card-processing fees charged on every swipe - fees that, being a percentage of the sale, rise automatically when prices rise. What remains as a fuel margin is thin and intensely local, which is why the same brand can post different prices two exits apart: each station is solving its own small equation of rent, competition, and traffic, not reading from a national script. It is also why stations work so hard at the shop, the car wash, and the coffee counter. For many of them, the gallon is what brings the car in; it is not where the dependable money is made.

For the reader, the practical point is that this slice explains neighborhood differences, not national ones. When every station in a city is up 40 cents, the cause is upstream - crude, refining, or taxes. When one station is up 40 cents and the station across the road is not, you are looking at the distribution and marketing slice doing its local work: a new lease, a closed competitor, a delivery problem, or simple pricing choice. Confusing the two scales is the most common error in everyday fuel-price talk.

5. Slice four: taxes, the part that only moves by law

Taxes are the quiet slice. The federal excise tax on gasoline is 18.4 cents a gallon - 24.4 cents on diesel - and it has not changed since 1993. It is a fixed number of cents, not a percentage, so it neither rises nor falls with the market; inflation simply shrinks its real weight year after year. State taxes and fees are added on top, and this is where the map starts to matter. State charges differ by tens of cents from one state to the next, some states apply additional fees or sales-tax mechanics, and a few cities and counties add their own layer. The EIA's January 2026 national mix put taxes at about 18 percent of the average gallon, but that average hides the widest geographic spread of any slice in the stack.

The cleanest way to see it is to hold the week constant and let the city vary. In EIA retail prices for the week of September 28, 2026, carried in this site's city fuel prices data, regular gasoline averaged $3.85 a gallon in Houston and $4.03 in Denver, against $6.16 in Los Angeles and $6.27 in San Francisco. Houston sits beside the largest refining cluster in the country, with short hauls and Texas-level fuel taxes. California combines higher state taxes and fees with its own cleaner-burning fuel specification, a refinery fleet that must supply a huge market under those rules, and long distances from the Gulf Coast refining center that supplies so much of the rest of the country. Seattle, at $5.68 that week, shows the same pattern at a smaller scale: West Coast supply is its own island, priced off its own refineries and rules. The crude in all of those gallons came out of the same global market in the same week. A gap of $2.31 between Houston and Los Angeles is what taxes, specifications, and logistics can do without crude moving a cent.

Retail regular-grade prices from the EIA weekly retail gasoline series for the week of September 28, 2026, as carried in PetroEyes city fuel price data (converted at 3.785 litres per U.S. gallon). Wholesale crude and product figures elsewhere on this page are the EIA weekly averages for the week ending September 25, 2026, from the PetroEyes EIA export refreshed October 5, 2026.

6. One gallon, fully stacked: a worked example

Tables of percentages are tidy, but a single gallon with real numbers is easier to carry in your head. Take the late-September 2026 data already used above and stack it. The crude slice is $2.23 (WTI at $93.57 a barrel, divided by 42). The wholesale product in New York Harbor printed $3.58, so about $1.35 a gallon sits between crude input and wholesale gasoline - the refining and blending space. From the wholesale rack to a Houston pump at $3.85, only about 27 cents remains to cover transport within the region, the station slice, and Texas-level taxes, because Houston buys close to where the fuel is made. Run the same wholesale starting point toward San Francisco at $6.27 and the post-wholesale space is roughly $2.69 - and that is before remembering that California fuel is a different, costlier specification that does not even start from the same wholesale print. The point of the exercise is not the exact cents, which shift weekly. It is that the pump price stops being mysterious the moment you force every cent to belong to one of the four slices. Any cent you cannot assign is a question to ask, not a conspiracy to assume.

Read the table as a set of sieves, not a set of invoices. The crack row and the wholesale-minus-crude gap are cousins, not twins: one is a futures-market margin on a standard contract, the other is a spot wholesale print minus a crude average, and blending, timing, and grade differences keep them from matching to the cent. Honest fuel arithmetic always has that kind of residue. What it should never have is a missing dollar. If a commentator explains a pump price using only crude, or only station margins, or only taxes, they have shown you one sieve and hidden the other three.

7. Why the mix itself keeps changing

The January 2026 shares - 51, 20, 11, 18 - describe one month. The structure underneath them guarantees they will not sit still. Crude is the swing slice: double the barrel price and, with the other slices roughly steady in cents, the crude share jumps mechanically toward three-fifths of the price or more, which matches the EIA pattern reported across past spikes. Halve the barrel and the tax slice, which never took a market holiday, suddenly looks enormous as a percentage - which is why low-price years produce so many arguments about the tax share. Nothing about taxes changed. The denominator did.

Refining is the second swing factor, and it swings to its own drummer. A large refinery outage, a hard spring blend changeover, or a run of product draws in the weekly EIA report can widen the refining slice for weeks while crude trades sideways. The reverse also happens: after a demand scare, product can pile up faster than crude falls, compressing the refining slice even as headlines focus on the barrel. Distribution and taxes, by contrast, are ballast. They change with leases, freight, competition, and statutes - slowly, locally, and usually in full public view. A useful habit follows from all of this: compare slices in cents per gallon when you want to know what changed, and in percentages when you want to know what dominates. Mixing the two is how a 5-cent tax debate ends up blamed for a 90-cent crude move, and how a refinery outage gets mistaken for a global shortage.

8. How to read the next price jump: a four-question check

When the sign moves and the commentary starts, run the stack before running with a story:

1. Did crude actually move? Check WTI and Brent over the same days on the markets page, then divide the barrel move by 42. If that accounts for most of the pump move, you have a crude story, and the WTI versus Brent guide helps you judge whether it is local or global.
2. Did gasoline outrun crude? Compare wholesale gasoline or RBOB against crude. A gap that widens is the refining slice expanding - look for outage news, blend changeovers, and product draws in the weekly analysis, and read the crack spreads guide before accepting a shortage claim.
3. Is it everywhere or somewhere? A national move lives in crude or refining. A one-state or one-city move lives in taxes, fees, specifications, or regional logistics - the city prices page shows how wide that local spread normally runs.
4. How fast, and in which direction? Rises transmit faster than falls for structural reasons, not just bad faith. The rockets and feathers guide measures the asymmetry in this site's own weekly data and shows how long each link in the chain usually takes.

Four questions will not tell you tomorrow's price, and anyone who claims they can is selling something. What they will do is assign every move to the slice that caused it, which turns an alarming headline into a checkable claim. That is the whole skill. Fuel prices are not one market with one mood; they are four markets bolted together, and they reward being read separately.

9. Frequently asked questions

What are the four parts of the price of a gallon of gasoline?

The U.S. Energy Information Administration (EIA) splits the retail price into crude oil, refining costs and profits, distribution and marketing costs and profits, and taxes. In the EIA monthly breakdown for January 2026, crude was about 51 percent of the price, refining about 20 percent, distribution and marketing about 11 percent, and taxes about 18 percent. The mix changes every month as crude and refinery margins move.

How much of the pump price is just the crude oil?

Roughly half in a typical month, and more when crude spikes. The arithmetic is simple: a barrel holds 42 gallons, so a $93.57 barrel carries about $2.23 of crude cost into each gallon of refined product. In the week ending September 25, 2026, that was the crude slice implied by this site's EIA price export. When crude prices jump, the crude share of the pump price can pass 60 percent, which squeezes the percentage left for everything else even if those costs barely change in cents.

Why did gasoline rise when crude oil did not?

Because the refining slice can move on its own. Refinery outages, seasonal blend changeovers, and tight product inventories widen the gap between wholesale gasoline and crude - the crack spread - and the pump follows the wholesale product price, not crude directly. In late September 2026 this site's futures book put the gasoline crack near $48.80 a barrel, about $1.16 a gallon, which is a wide refining slice by historical standards.

How much tax is in a gallon of gasoline?

The federal excise tax is 18.4 cents a gallon on gasoline and 24.4 cents on diesel, unchanged since 1993. State taxes and fees sit on top and vary far more - that variation is a large part of why the same fuel cost $3.85 a gallon in Houston and over $6 in Los Angeles and San Francisco in the same week of September 2026, on EIA retail prices carried in this site's city data.

Do gas stations keep most of the money?

No. The station sits inside the smallest slice of the four - distribution and marketing, about 11 percent of the price in the EIA January 2026 breakdown - and shares it with the wholesaler and the trucking that moves fuel from terminal to pump. Out of that slice the station pays for delivery, labor, rent, card fees, and upkeep before anything is left as fuel profit, which is why stations lean on shop sales and why fuel margins are fiercely local.

What should I check first when pump prices jump?

Ask which slice moved. Compare crude (WTI or Brent) with wholesale gasoline over the same days: if both rose together, it is a crude story; if gasoline outran crude, it is a refining story; if prices jumped in one state only, look at taxes, fees, or a regional supply problem. Our markets page tracks the benchmarks, the analysis page tracks the weekly inventory and refinery picture, and the crack spreads guide explains the refining slice in depth.

10. Related reading

• Refinery Crack Spreads, Explained - the refining slice as a traded margin: formulas, regional benchmarks, and how to read wide versus narrow spreads.
• Rockets and Feathers: Why Gasoline Prices Rise Fast and Fall Slow - how quickly each slice passes a crude move through to the pump, measured on weekly data.
• WTI vs Brent Spread Explained - why the crude slice itself has two different prices, and what the gap says about regional balances.
• How to Read the EIA Weekly Petroleum Status Report - the Wednesday data release behind the inventory, refinery, and demand figures used on this page.
• OPEC+ Explained - how producer decisions feed into the crude slice from the supply side.
• Natural Gas (Henry Hub) Price Today - the same benchmark habit applied to the other fuel most households buy.

Data and sources: U.S. Energy Information Administration - Gasoline and Diesel Fuel Update monthly pump-price components (January 2026 shares); Weekly Petroleum Status Report weekly averages for the week ending September 25, 2026 (WTI $93.57 per barrel, Brent $117.08, New York Harbor gasoline $3.58 per gallon, refinery utilization 92.5 percent, gasoline supplied about 8.69 million barrels a day), via the PetroEyes EIA export refreshed October 5, 2026; EIA weekly retail gasoline prices by city for the week of September 28, 2026, via PetroEyes city fuel price data; federal excise rates of 18.4 cents per gallon on gasoline and 24.4 cents on diesel, unchanged since 1993 (Congressional Budget Office and IRS rate schedules). Worked per-gallon figures divide barrel prices by 42 gallons and are labeled as approximations where rounding applies.