Does Fuelly support non-US currencies?

Yes. First, set your country in your profile by clicking the "settings" link at the top-right of the page. Once your country is set, your vehicle profile pages will let other users know which currency you're using for fuel-ups. When you're reading the site, you can assume that prices are in US Dollars. If a Fuelly member has specified a country in their profile, you'll find a flag with their currency located below the cost analysis (receipt graphic) on their vehicle profile page: If you don't recognize the flag you can hover your mouse over the flag to get the name of the currency.