For the Brits
 

To make this more frendly for British people, we could do with an interface that allows us to input details in £ per litre and litres bought, but display our consumption as MPG. The UK still doesn't use L/100km.
At the moment I'm having to multiply my litres bought and price paid by 4.55 each time which makes it awkward to use.

If you're in the UK, there are a couple things you need to do. First, when you set up your car, make sure you choose Litres as your reporting units. Here's what that option looks like:

https://www.fuelly.com/images/new-car-choices.png

You want to choose Litres instead of the default US gallons.

Then, make sure you click the "UK" link in the upper left corner of any page. (more info.) Once you click that, the site will show you UK MPG instead of US MPG.

You might also take a look at our FAQ: I'm in the UK. Will Fuelly work for me? At the bottom there's a link to an offsite FAQ that has even more tips/tricks for Fuelly users in the UK.

u want to set it to UK as said

Track fuel in litres

track distance in miles

then u should be good