Running on empty

[Axton]

Is it realistic? I've filled the tank when the needle was in the red - it wasn't bone dry I had 10 miles range left.

When the needle was in the red (not rock bottom) I filled up the tank until the auto-stop.
I set the trip meter to 0 and commuted until the needle is back in the red, the in-car computer showed I had 10miles range left but I decided to fill up rather than completely run out trying to get to the next station on route.

I took the reading of the trip meter - 641.6

I understand that this isn't running the tank dry but it's unrealistic to do so. Does this mean I'm getting correct information, as my readings on Fuelly look too high!

On an average drive to work my car computer says I'm getting 55 - 60 (all pretty much A roads) however Fuellly says my best MPG is 74.3 ?????????

Am I doing this correctly?

Many thanks