To put things in perspective, "our" local weekly blogger, Eric Descarries at La Presse, had a TDI Jetta with DSG last week. His average? 9.5 l/100 km, and he doesn't trust trip computers. All his numbers are calculated, and he reports how the computer compares to the fuel pump math.
This guy got some nice mail from Smart owners after he reported 8.9 l/100 km after a week in the mobile phone booth.