Question about mpg calculation

[lucifuge21]

Hi everyone,

I'm new to Fuelly and i have a couple of stupid questions for you:

• Why do I need a full fillup in order for mpg to appear?

How is the mpg calculated even after a full fillup? I'm asking this, because in my case I have travelled 491km with 39,6L (partial fillups) till my first full fillup. If you calculate the mpg is about 8,08 L/100km. However, the Fuelly calculates the mpg till then around 8,72 L/100km! I have attached a screenshot as well.

Probably this is something I'm missing in the way Fuelly calculates mpg.

Thank you in advance for your time.

John