I'm not sure exactly what mean. You can switch between odometer tracking and tracking miles per fuel-up on your vehicle settings page. Here's a bit more info. We use all of the information we can in calculating your average fuel economy, even if an individual fuel-up doesn't have a calculated MPG.
I noticed that right away. I created a dummy car and played with it to see how things worked. I'm used to entering a start odometer reading and ignoring the cost of the initial fill as the basis of tracking is full tank to full tank. Now the cost of the first tank is included.
All is good it will work out in the end I just had a good first fill mileage... pity. I just created a dummy fill before it for the dealer km's and first fill.