Energy

How Oil Prices Affect Your Finances: From Petrol to Energy Bills

Brent crude right now: — / barrel Live · Brent

April 2026 · 5 min read · QuidCast Guides

⚠️ Not financial advice. This guide is educational only. Investments can fall as well as rise. Always consult an FCA-authorised adviser before making financial decisions.

Quick answer

Oil is one of the most pervasive prices in the economy. Around 40–45% of the pump price tracks crude, so a 10% oil fall trims petrol by roughly 4–5p a litre, not 10%. Oil also feeds into energy bills, flights and food prices, often with a lag of months.

The price of oil is one of the most pervasive prices in the modern economy. When it moves significantly, almost everything you buy is affected.

The Direct Effect: Petrol and Diesel

Roughly 40–45% of the pump price is determined by crude oil. The rest is fixed fuel duty (57.95p/litre) and VAT. So when Brent falls 10%, expect a 4–5p/litre pump reduction — not 10%.

Energy Bills

Natural gas often moves with oil prices. A sustained oil fall tends to eventually reduce gas prices, which Ofgem passes through in quarterly price cap reviews.

Flights

Jet fuel is 20–30% of airline costs. Oil spikes → fuel surcharges. Falls → airlines are slower to pass savings on.

Food Prices

Oil affects agricultural machinery (diesel), fertilisers (natural gas) and refrigerated logistics. CPI food typically lags oil changes by 3–6 months.

Key TakeawayA 10% sustained oil price fall typically reduces UK CPI by 0.2–0.3 percentage points after 6 months — one factor the BOE watches when setting rates.

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Frequently asked questions

How much does a fall in oil prices cut petrol costs?

Only about 40–45% of the pump price comes from crude oil; the rest is fixed fuel duty (57.95p/litre) and VAT. So a 10% fall in Brent typically reduces pump prices by around 4–5p a litre, not the full 10%.

How do oil prices affect energy bills?

Natural gas prices often move with oil, so a sustained oil fall tends to eventually lower gas prices, which Ofgem passes through in its quarterly price cap reviews — usually with a delay.

Do oil prices affect food costs?

Yes, indirectly. Oil influences agricultural machinery (diesel), fertiliser (natural gas) and refrigerated logistics, so food prices in CPI typically lag oil price changes by around 3–6 months.