How much will it cost to drive X miles?

Miles to drive: miles

How far can I travel with X litres of fuel?

Litres of fuel: litres of fuel

Why?

For reasons I do not understand the UK measures fuel economy in "miles per gallon" but fuel volumes in litres. This makes it difficult to make estimations based on these figures...

This calculator allows you to make quick estimations of a journey's cost & fuel requirements.

Where do the fuel prices come from?

The fuel price is based on the average fuel price released weekly by the Department for Business, Energy & Industrial Strategy. You can find more information on this data here

You can also check the latest data from the RAC here.