Fuel consumption.

I got meself a Lancer Sportsback (a basic model);
Quiet happy (-:

Whilst waiting for the English version of the owners manual I'm at a
bit of a loss to know how it works out the fuel averages;
When I start off in the evening it could well say that I'm using 40
litre per 100 km. And then drop down to 9Ltrs/100km within, say, 300
metres. And by the time I'm almost home (10K further along)  it'll be
down to around the 4Ltrs/100km.

Does that mean that my average over the whole journey was the 4
litres/ 100 km... or is that 4 ... only representing the length of the
journey during which that "average" was been given?

I'm still on my first tank full.

If it represents the whole journey and I usually manage an "average"
of averages of about 4.3  then from the 59 litre tank I reckon I could
be getting around 1,372km... but right now I've done 739 km and the
computer says I could do another 210. That less than 950, which,
though a significant improvement on my last car..; some ways off the
1,372.

And that assuming I even have another 210Km of fuel left because,
well, the fuel calculator seems entirely ... well... I would hold my
breath on that one, let's just put it that way.