Gas price regulation in the United States rarely means the government setting a price per gallon. It means a stack of federal and state taxes, blending mandates, environmental fuel rules, antitrust oversight, emergency supply tools, and state-level anti-gouging and retail laws that together shape what you pay at the pump. In a typical recent year, crude oil accounts for roughly half the retail price, taxes about 17%, refining around 14%, and distribution and marketing the rest.1U.S. Energy Information Administration. Factors Affecting Gasoline Prices Regulation reaches directly into the tax slice, heavily into the refining slice through environmental rules, and only indirectly into the crude oil slice through emergency reserves.
Where Your Money Actually Goes
The U.S. Energy Information Administration splits gasoline’s retail price into four components. For 2025, those shares were approximately 51% crude oil costs, 17% federal and state taxes, 14% refining costs and profits, and 18% distribution and marketing.1U.S. Energy Information Administration. Factors Affecting Gasoline Prices Crude oil is the volatile piece, which is why global production cuts and geopolitical shocks produce the sharpest swings. Taxes are the most stable and predictable. Refining margins move seasonally, especially during the summer switch to cleaner blends. Distribution and marketing covers pipeline transport, terminal handling, and the station’s own overhead.
Federal and State Fuel Taxes
The most direct government-set cost in every gallon is the excise tax. The federal excise tax is 18.4 cents per gallon on gasoline and 24.4 cents per gallon on diesel.2Internal Revenue Service. Publication 510 (12/2025), Excise Taxes Within that federal rate, 0.1 cent per gallon funds the Leaking Underground Storage Tank Trust Fund, which pays for cleanup of contamination from aging fuel tanks.3U.S. Environmental Protection Agency. Leaking Underground Storage Tank Trust Fund The bulk of the revenue flows to the Highway Trust Fund for roads, bridges, and transit.4Federal Highway Administration. Motor Fuel and Highway Finance – Policy
State and local taxes stack on top, and the variation is dramatic. Some states levy as little as 9 cents per gallon in excise tax; others charge nearly 60 cents before other fees. When sales taxes, environmental surcharges, and carbon program costs are added, the total state-level burden in a handful of states climbs past 70 cents per gallon. The national average for state taxes and fees on gasoline is roughly 33 cents per gallon.5U.S. Energy Information Administration. Many States Slightly Increased Their Taxes and Fees on Gasoline Some states use a flat per-gallon rate that stays constant regardless of price. Others tie the rate to the wholesale price or an inflation index, so the tax rises and falls with the market.
The Renewable Fuel Standard
One of the largest federal mandates affecting gasoline is the Renewable Fuel Standard, administered by the EPA. The RFS requires refiners and importers to blend a specified volume of renewable fuel, primarily corn-based ethanol, into the nation’s gasoline and diesel supply each year. For 2026, the EPA has proposed a total renewable fuel volume requirement of approximately 24 billion ethanol-equivalent gallons.6U.S. Environmental Protection Agency. Proposed Renewable Fuel Standards for 2026 and 2027 In practice, most regular gasoline sold in the U.S. contains up to 10% ethanol (E10) because of this program.
Refiners demonstrate compliance by acquiring tradable credits called Renewable Identification Numbers. When credit prices spike, those costs pass down the supply chain and show up at the pump. The program also sets separate volume targets for advanced biofuels and cellulosic biofuel, which cost more to produce. For years after 2022, the EPA sets volumes using its own authority based on factors like energy security, commodity prices, and environmental impact.7U.S. Environmental Protection Agency. Final Renewable Fuels Standards Rule for 2023, 2024, and 2025
EPA Environmental Fuel Rules and Regional Price Gaps
EPA regulations require cleaner-burning fuel formulations in areas with the worst air quality. Reformulated Gasoline (RFG) must meet specific chemical composition standards designed to cut smog-forming emissions. Roughly 30% of the gasoline sold in the U.S. is RFG. The specialized refining adds to production costs, and because RFG cannot always be freely swapped in from other regions, supply disruptions in RFG areas tend to cause sharper local price spikes. Multiple states and metro areas also require their own unique blends, sometimes called boutique fuels, which further fragment the national supply and limit the ability to ship surplus fuel from one region to another.
Federal Oversight of Competition and Supply
FTC Antitrust Enforcement
The Federal Trade Commission monitors wholesale and retail gasoline markets for price-fixing, market allocation, and other anti-competitive conduct. Its authority runs primarily through the FTC Act, which prohibits unfair methods of competition, and the Clayton Act, which lets the agency block mergers that would substantially reduce competition.8Federal Trade Commission. Guide to Antitrust Laws The FTC has investigated every major petroleum industry merger over the past several decades and has at times required companies to sell off retail stations as a condition of approval.
The agency’s economists track retail gasoline prices in roughly 360 cities and wholesale terminal prices in 20 major metro areas, watching for pricing patterns that suggest coordination rather than normal market forces.9Federal Trade Commission. Investigation of Gasoline Price Manipulation and Post-Katrina Gasoline Price Increases Much of federal price oversight lives in that quiet surveillance work.
The Strategic Petroleum Reserve
The Strategic Petroleum Reserve is the world’s largest government-owned emergency oil stockpile, authorized under the Energy Policy and Conservation Act of 1975. The President can order crude drawn from the SPR and sold at public auction when three conditions are met: an emergency situation causes a significant supply reduction, the disruption produces a severe price increase, and that price increase threatens major harm to the national economy.10Office of the Law Revision Counsel. 42 U.S. Code 6241 – Drawdown and Sale of Petroleum Products Releases don’t set a price. They add supply to the market, which pushes prices down during a crisis. The reserve is authorized to hold up to one billion barrels, though actual inventory fluctuates with past drawdowns and refill purchases.
Price Gouging Laws During Emergencies
Direct price caps on gasoline are rare and almost always temporary. The closest thing to a price ceiling comes through state anti-price-gouging statutes, which roughly 39 states and the District of Columbia maintain. These laws activate only when the governor or another designated official formally declares a state of emergency, typically after a natural disaster, severe weather, or supply disruption.
Once triggered, the statutes generally prohibit selling fuel at an unconscionably excessive price. Most states define that by comparing the current price to what the seller charged in the days or weeks before the emergency. A price increase beyond what the seller’s own higher wholesale or transportation costs justify can be treated as a violation. The comparison window and the allowable markup vary considerably. Some states measure against a 7-day pre-emergency average; others use a 30-day window.
Enforcement usually falls to the state Attorney General’s office, with penalties ranging from civil fines to criminal misdemeanor charges depending on the jurisdiction and the severity. Some states allow fines per transaction, so a high-volume station can face substantial cumulative penalties. A few states also give consumers a private right of action to sue retailers directly for damages, though this is the exception.
If you suspect price gouging during a declared emergency, file a complaint with your state Attorney General. The U.S. Department of Energy also maintains a federal reporting page that directs consumers to the right state and federal contacts, including the FTC’s complaint system.11Department of Energy. Report Gas Price Gouging Note the price you paid, the date, the station location, and keep your receipt. That evidence is what investigators need to build a case.
State Retail Rules That Affect the Pump Price
Minimum Markup Laws
Roughly 9 to 11 states have gasoline-specific minimum markup laws, and about 20 more have broader below-cost sales laws that can reach fuel. These statutes require retailers to price gasoline a set percentage above their wholesale cost, with mandated markups ranging from about 3% to just over 9% depending on the state. The stated intent was to keep large chain retailers from selling below cost to drive independents out of business. The practical effect is that even when wholesale prices drop sharply, the pump price in these states can only fall so far.
Pump Accuracy and Fuel Quality
Every state has a weights and measures agency that verifies fuel dispensers charge you for the amount you actually receive. Inspections happen on a regular cycle, often every one to two years, with stations that fail placed on more frequent schedules. Inspectors test pumps using calibrated reference containers. Under national standards set by the National Institute of Standards and Technology, a retail fuel dispenser must be accurate within narrow tolerances: 0.3% error for newly installed equipment, 0.5% for equipment already in service.12National Institute of Standards and Technology. 2023 NIST Handbook 44 Section 3.37 A pump that fails is typically red-tagged and taken out of service until a licensed technician repairs it.
These agencies also enforce fuel quality. Inspectors pull samples to check octane ratings, water contamination, and composition standards. If you suspect a pump shortchanged you or that bad fuel damaged your engine, contact your state’s department of weights and measures or department of agriculture, whichever handles fuel regulation where you live. If contaminated fuel causes vehicle damage, you may have a negligence claim against the station, but you’ll need documentation: your receipt, a mechanic’s diagnosis linking the damage to fuel contamination, and repair records showing the cost.
Electric Vehicle Charging and the Tax Gap
As more drivers switch to electric vehicles, fuel tax revenue is shrinking and states are moving to replace it. At least 41 states now charge a special annual registration fee for electric vehicles, ranging from $50 to $290 per year. A few states have also begun taxing electricity dispensed at public charging stations on a per-kilowatt-hour basis, essentially the EV equivalent of a gas tax.
Regulation of the charging experience itself is still catching up. NIST’s Handbook 130 now includes a standard requiring that electricity sold as vehicle fuel be priced in kilowatt-hours, with the unit price displayed in whole cents or tenths of a cent. Adoption varies by state, and some charging networks still price by the minute or by the session rather than by energy delivered, which makes cost comparison harder. Expect more states to bring charging stations under the same weights-and-measures oversight that governs gas pumps.