How do I calculate fuel cost for a journey?

Divide the distance by your fuel efficiency (mpg), convert to litres (1 UK gallon = 4.546 litres), then multiply by the price per litre. For a return trip, double the result. Split between passengers for the per-person cost.

What is average UK fuel efficiency?

The average UK car achieves about 36-40 mpg in real-world driving. Smaller cars may achieve 45-55 mpg. SUVs and 4x4s typically get 25-35 mpg. Motorway driving is generally more efficient than urban driving. Loaded cars with roof boxes lose 10-20% efficiency.

How much does fuel cost in the UK?

UK fuel prices fluctuate but typically range from £1.30-1.60 per litre for petrol and £1.35-1.65 for diesel. Motorway service stations are significantly more expensive — fill up before you get on the motorway. Supermarket fuel stations are usually cheapest.

Should I factor in other driving costs?

For a comprehensive trip cost, also consider: parking at the trailhead (£2-10/day in popular areas), toll roads (e.g. Dartford Crossing, M6 Toll), congestion charges, and wear-and-tear (HMRC rate is 45p/mile for the first 10,000 miles, which includes all running costs).

CampCalcs

Mileage Calculator

Calculate driving distance fuel costs for getting to your campsite or trailhead.

One-Way Distance

Fuel Efficiency

Fuel Price

Passengers

Including driver

Fuel Type

How We Calculate This

Fuel Calculation

Fuel (litres) = (Distance in miles / MPG) x 4.546

Cost = Fuel litres x Price per litre

CO2 Emissions

Petrol: 2.31 kg CO2 per litre. Diesel: 2.68 kg CO2 per litre.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify conditions and use proper safety equipment outdoors.