Foundationsexplainers
Why Gas Prices Fluctuate: Crude, Refining, and Taxes
Learning objectives
- Break down the components of the pump price
- Explain why crude oil dominates price moves
- Describe refining and seasonal effects
- Explain regional price differences
The price stack
A gallon's price stacks four layers: crude oil (usually the biggest), refining costs and margins, distribution and marketing, and taxes. Crude's share swings most, so oil headlines drive pump headlines — but the other layers explain why prices differ across regions and seasons.
Roughly half or more of the pump price is crude; when oil jumps, gasoline follows within weeks.
Refining: the bottleneck layer
Refineries turn crude into gasoline, and their capacity is finite. Maintenance shutdowns, accidents, or summer-blend requirements squeeze this layer, spiking regional prices even when crude is calm. Different regions use different fuel blends, fragmenting the market.
Taxes and station margins
Fuel taxes vary widely by jurisdiction, creating persistent regional gaps. Station markups are thin and competitive — most stations earn more from snacks than gasoline. When wholesale prices fall, retail follows slowly ('rockets and feathers'); when they rise, pumps adjust fast.
Pump prices shoot up with crude but drift down slowly — a well-documented asymmetry from market power and consumer inattention.
Reading price swings
Spikes usually trace to crude shocks or refinery outages; slow declines reflect sticky retail margins. Policy levers — reserves releases, tax holidays — move prices at the margin but can't override global crude markets. Educational content only.
This article explains fuel pricing. It is not investment advice.
Key points
- Pump price = crude + refining + distribution + taxes
- Crude oil is the dominant and most volatile layer
- Refinery outages cause regional spikes
- Taxes create persistent geographic differences
- 'Rockets and feathers' describes asymmetric adjustment
Common misconceptions
✓ Truth: Retail margins are thin; most profit comes from convenience sales, not fuel.
✓ Truth: Global crude markets dominate; policy moves the margin, not the level.
✓ Truth: Blends, taxes, and transport differ by region, fragmenting prices.
Frequently asked questions
Why do prices vary so much between states?
Different fuel taxes, blend requirements, refinery access, and transport costs.
What are summer blends?
Cleaner-burning formulations required in warm months; costlier to make, nudging seasonal prices up.
Do gas tax holidays work?
They cut prices temporarily by the tax amount, but stations may capture part and crude moves dominate.
Why do prices fall slowly?
Low consumer search intensity and local market power let retailers widen margins on the way down.