Why Petrol Prices Lag Oil
What Makes Up the Pump Price
You're seeing the price at the pump, but only part of that is crude oil. It's made up of several parts: the crude cost is a big one, but on top of that come the fees for refining, transporting fuel to filling stations, the retailer's own margin, plus tax. Taxes are split between excise duty (a fixed amount you pay per liter in many places) and value added tax, or VAT, which is applied as a percentage. Sometimes, especially where tax rates are high, these taxes make up a bigger share of the pump price than crude itself. The type of crude also plays a role, which gets discussed under sweet vs sour crude oil.
So when crude moves, the entire pump price doesn't adjust by the same amount. If crude jumps by a certain number, retail prices change by less than that because all those other pieces stay where they are.
Why Pump Prices Lag Crude Moves
Changes in crude don't automatically show up in what you pay at the station. Wholesale supply is bought ahead and sits in storage terminals before reaching your local pump, so there's always some delay. And the details behind crude price moves are a bit involved, as outlined in what drives oil prices. Retailers also watch their competitors, if nearby stations haven't changed, some may wait before shifting their own price.
Economists have found that when oil goes up, retail prices jump quickly, but when oil drops, pump prices tend to drift down. This "rockets and feathers" behavior isn't a rule everywhere, but it's well documented in certain markets and times.
Refining Margins and Tax Rules
The refining margin is what sits between the cost of crude and the price paid for its refined end products. It can rise fast if a refinery goes offline or seasonal demand spikes, or it can fall if there's lots of spare capacity. If margin costs go up, even with no change in crude, the pump price can still rise.
Tax design matters, too. Fixed taxes per liter and percentage-based VAT each shape the pump price in different ways. These taxes can easily make up more than half the total, so a movement in crude as a percentage gets watered down. You can check the latest rates with your national tax office, as they're set country by country.
A Worked Example of a Crude Price Rise
If crude climbs 10 units per barrel, with roughly 159 liters in a barrel (see barrel units and conversions), you get a crude price jump of about 0.06 units per liter. Add a percentage tax and that per-liter price hikes a bit more. Retailers might not change pump prices overnight, sometimes only a part of the increase feeds through at first. The rest can show up over days or weeks. These calculations are only for demonstration; real amounts will vary.
Frequently asked questions
Why don't petrol prices fall as fast as oil prices?
Pump prices aren't just based on crude oil. Taxes, refining, deliveries and the station's margin all factor in, and they don't shift up or down alongside crude. It's also common for retailers to leave prices higher for longer as wholesale costs fall, especially if there isn't much local competition. So the price you see at the pump usually can't drop as fast as crude does, though that depends on your country's market.
Does a lower oil price always lower petrol prices?
A drop in crude oil almost always pushes pump prices lower, but not in every case and not the same day. Other things can offset it, a wider refining margin or unchanged taxes, for instance. And retailers don't always pass on every change right away. Oil and petrol prices move a lot. Trading in oil-linked products carries a risk of loss.