I've managed to meet and exceed the figure for all of my carsBut only when I actively tried to get the best consumption I could.
I'm guessing you haven't driven anything remotely modern then? Anything in the last 8 years basically struggles to get quoted figures. This is due mostly to the "standardised" testing method employed to get the figures. And how it is in no way relevant to real world driving. However, as almost every new-ish car uses this method, it can be used to compare one car against another. Just not against real world driving.
Older cars, yes, you can often get very close to, or break, the quoted figures.