That's great to know - I'm in the UK and fuel is purchased in liters, but distances in car computers are measured in British gallons (don't ask why)! In the rest of Europe fuel is also purchased in liters but of course they measure distances in kilometers.
Great to know that liters are on the way! For now I'll just do the conversion before entering the data:
1 US Gallon = 3.78 liters
1 US gallon = 0.83 UK gallon
I've just signed up today, looks like a great site! Love the mobile phone option too