I'm in the UK. Will Fuelly work for me?

Yes! Make sure you set your home country to "United Kingdom" in your profile, and click the "UK" link in the upper-left corner of the page to set your viewing units to UK across the site. (Here's more info about switching viewing units.) When you create a vehicle, make sure you set your reporting units to Litres instead of US gallons. You'll also want to set your vehicle reporting units to track distance in Miles. It'll also help to know that petrol = gas on this site. Fuelly member udtrev wrote a great Fuelly FAQ for folks in the UK, take a look there for more info.