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Why Gas Prices Don't Drop When Oil Does: The Refining Margin Gap

Crude oil prices have fallen, but gas prices at the pump have not followed. The gap comes down to refining margins, regional taxes, and distribution costs that crude spot prices do not capture.

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The simple version

The national average for regular gasoline was $3.19 per gallon as of the week of June 23, 2026, even as West Texas Intermediate crude oil traded near $67 per barrel, well below its 2022 peaks. If you have been watching oil prices fall and wondering why your fill-up is not getting cheaper fast, the answer is that crude is only one piece of what you pay at the pump. Refining, taxes, and getting the fuel from a refinery to your local station together account for roughly 40 to 50 cents of every dollar you spend on gasoline, and those costs do not move in lockstep with crude.

The lag is real and structural. When crude drops, refiners do not immediately pass savings through. Refining margins, which are the spread between what refiners pay for crude and what they sell refined products for, can stay elevated for weeks or months depending on regional capacity, seasonal demand, and inventory levels. Your gas bill is the sum of all those layers, not just the crude price your phone shows.

The numbers

  • $3.19 per gallon: national average retail price for regular gasoline, week of June 23, 2026 (EIA Weekly Retail Gasoline and Diesel Prices, eia.gov)
  • Roughly $67 per barrel: WTI crude oil spot price as of mid-June 2026, compared to over $120 per barrel in June 2022 (FRED, fred.stlouisfed.org/series/DCOILWTICO)
  • Approximately 18.4 cents per gallon: federal excise tax on gasoline, unchanged since 1993 (U.S. Treasury, treasury.gov)
  • State gasoline taxes range from under 9 cents per gallon in Alaska to over 68 cents per gallon in California as of 2026 (EIA, eia.gov)
  • Refining costs and profits have historically represented 15 to 25 percent of the retail price of gasoline, varying by region and season (EIA, eia.gov)
  • Distribution and marketing costs add roughly 5 to 10 cents per gallon on top of refining, taxes, and crude (EIA, eia.gov)

Why crude oil price and pump price are not the same number

Think of crude oil as the raw ingredient in a recipe. The recipe also calls for refining (which turns crude into usable gasoline), transportation (pipelines, tanker trucks, and terminals), regional taxes (federal plus state, which vary by up to 60 cents per gallon depending on where you live), and a retailer margin at the station itself. Crude is typically the largest single input, representing roughly 50 to 60 percent of the retail price in normal market conditions, but it is not the whole bill.

Refining capacity is the critical chokepoint. The United States has not opened a major new refinery since the 1970s. When demand for refined products is high relative to available capacity, refining margins widen. This is why gasoline prices sometimes stay high even when crude falls: refiners are running near capacity and the spread between crude cost and finished-product price stays fat. The EIA tracks this as the crack spread, the difference between crude input cost and the price of refined output. A wide crack spread means refiners are capturing more margin per barrel, and that margin does not disappear just because crude softens.

There is also a timing issue. Gasoline at your local station was refined from crude that was purchased and contracted weeks earlier. When crude prices fall sharply, the refined fuel sitting in regional terminals and distribution pipelines was produced from higher-cost crude. That inventory has to clear before cheaper-crude gasoline reaches the pump. The EIA estimates this lag averages two to six weeks depending on region, time of year, and how fast crude prices moved.

Taxes add another floor that crude cannot undercut. Federal excise tax has been 18.4 cents per gallon since 1993 and does not move with oil prices. State taxes layer on top of that. In California, combined state and local taxes add over 68 cents per gallon before any other cost is counted. No matter how low crude goes, those fixed costs stay in the price. That is why a crude oil price collapse does not translate into a pump price collapse of the same magnitude.

The Real Cost lens for a driver filling up 12 times per year with a 15-gallon tank

Most households do not buy gasoline in barrels. They buy it in gallons at a local station, roughly twice a month. Here is what the gap between crude price and pump price actually costs a typical household annually, using the current numbers.

  • Assumed fill-ups: 24 per year, 15-gallon tank (360 gallons annually)
  • Current pump price: $3.19 per gallon, so $1,148 per year in gasoline
  • If pump price matched crude-only cost (crude at roughly $1.59 per gallon equivalent, no taxes, no refining margin): hypothetical per-gallon cost would be far lower, but taxes alone (federal 18.4 cents plus a median state rate near 30 cents) add roughly 48 cents per gallon minimum, putting a no-refining-margin floor near $2.07 per gallon, or $745 per year
  • The gap between the floor and the actual price ($3.19 minus $2.07 = $1.12 per gallon) represents refining margin, distribution cost, and retailer margin: that difference costs the average household roughly $403 per year even if crude stayed at current levels

That $403 is not waste and it is not a conspiracy. It pays for actual infrastructure: refineries, pipelines, terminals, and the tanker trucks that show up before the station runs dry. But it does clarify why presidential frustration with pump prices is understandable and also somewhat beside the point. The part of the price that responds to crude is real. The part that does not is structural, and it does not move with a tweet or a speech.

What this means

Gas prices are a political lightning rod in part because every driver sees them multiple times a week on signs at eye level. They feel like a direct report card on economic management. But the structure underneath them is less responsive to policy signals than the politics suggest. Refining capacity takes years and billions of dollars to expand. Federal tax rates require an act of Congress to change. State taxes are set by state legislatures on their own calendars. None of those inputs move quickly when crude falls.

For your own budget, the useful number is not crude oil futures. It is the EIA's weekly retail price for your region, which you can find at eia.gov and which reflects what you will actually pay. If you drive a lot and gas is a meaningful line item, regional variation in state taxes matters more than daily crude movements. Filling up in a lower-tax state when you have the option is a more reliable savings lever than timing a fill-up around crude price news.

What this is NOT

This is not a prediction of where gasoline prices will be in July or August 2026. This is not a recommendation to buy, sell, or hold any energy stock, ETF, or commodity position. This is not an endorsement of any political position on domestic energy production, refinery permitting, or fuel tax policy. This is not advice on whether to buy an electric vehicle, a hybrid, or a gas-powered vehicle based on current fuel prices. This is not a calculation of your specific household's gasoline cost; your actual cost depends on your vehicle, your local state tax rate, and how many miles you drive.

Sources

  • EIA Weekly Retail Gasoline and Diesel Prices: https://www.eia.gov
  • FRED: WTI Crude Oil Spot Price (DCOILWTICO): https://fred.stlouisfed.org/series/DCOILWTICO
  • EIA: Gasoline Explained, Use and Supply: https://www.eia.gov
  • U.S. Treasury: Federal Excise Tax on Motor Fuels: https://www.treasury.gov
  • EIA: State Motor Fuel Taxes and Fees: https://www.eia.gov

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