I am ready to enter my first tank in the database, but I am debating whether to use the value given by the Nav's consumption screen (this is the first tank), or to use the "tank avg" given by the Info display on the speedo?

I am hesitant to use my calculated value, since I don't know how full it was when I picked it up. I also think there can be a lot of variability when filling (and topping off when I do this)...

The info display seems to read a bit lower than the one on the Nav system (33.3 on the Nav screen, vs 32.? on the info display). I forgot to look at it before refueling! Is there a way to see the previous tank's value?

My gut tells me that the value given on the speedo display is more realistic, but I am not sure. I reset the nav system's avg to see if it matches up well with the speedo display.

I might just skip this tank and use the speedo info display for future tanks...