Check out one of the 35875357* threads on fuel economy here.
And then remember, its hard to compare one with another as we all have different driving styles, drive different roads, different conditions etc etc.
Many variables.
Also, take what the computer says with a grain of salt.
I don't think i've ever seen a car run out of fuel the moment the computer says 0km to go.
Its really more of a scare tactic, and a warning that running the car that low in fuel can cause harm
*figure may have been a slight exaggeration
2013 Ford Focus ST - Performance Blue, Cobb AP
Gone 2006 3 MPS Sports - True Red, Koni FSD shocks, in dash OEM look Ebay GPS/DVD, Hypertech, RX8 Rims