Fuel consumption. No data?

Fuelio doesn't show fuel consumption even if I have many fillups added in the mileage log. How many fillups do I need to add to see consumption

To see fuel consumption (fuel economy) and some other values in the Stats you need at least two full fillups. Fuelio is using full tank algorithm to calculate consumption. It's the most accurate algorithm to calculate that. Thanks to that I can calculate how many litres/gallons you have used between fillups. There are other algorithms for example based on empty tank but it's a little bit less accurate and it's not safe to drive with empty tank.

Maybe this will show as option in future updates.