How far is it worth driving to save X pence per litre?

If you use a site like PetrolPrices.com, you might find out that the supermarket 8 miles away is selling petrol at 4p per litre less than the one just around the corner.

But is it actually worth driving that distance? Fill in the details below and we’ll tell you!

What's the capacity of your fuel tank in litres? litres

This site might help if you don't know.

Roughly how full is your tank at present? %

For example, put 33 if your tank is 1/3 full. We'll assume you want to fill it up.

How much does the closest fuel cost? £ per litre

How much does the more distant fuel cost? £ per litre

By filling up at the remote location...

unknown

However...

How many miles per gallon do you expect to get? mpg.

How much further will you need to drive to reach the more distant fuel station? miles.

If you're going there and back, remember to include both directions. If you're making a diversion, how much does it add to your journey?

So by driving to the remote location...

...

Important note

Please note that this is a rough calculation and and only covers fuel costs. It doesn’t take into account any other running costs, such as tyre rubber! And note that after you’ve driven to a remote station and back, you won’t quite have a full tank any more!

If the numbers look implausible, please check your inputs. If you think I’ve made a mistake, please let me know!