Do I have to fill the Odometer reading even in partial fuel-ups??

[alexring]

I'm a relatively new user and tried to combine two fill-ups, apartial and a complete one.

I didn't take note of the odometer in the partial fill-up, thinking that Fuelly will calculate the total consumption from my last complete fill-up (making an average of the two)
But instead of this it calculated nothing for the partial one (as expected) and a rediculous low milage for the complete one, as it thought I did all these km's with just the fuel of the last fill-up.

I thought that the point of the partial fill-ups option was that you don't have to write down your odo reading (which is a pita as you have to have a pen ready which is not always easy for me) and just keep the receipt from the station, so that Fuelly will calculate all the fill-ups when you finally do a complete one and fill the Odo reading.

Am I missing something?