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

Distance measurement

Fuel Efficiency

Your system mash efficiency percentage

Fuel Price

Price per unit

Passengers

Including driver

Fuel Type

Fuel amount or 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.