Hi,
I also have the 1.6, but I have to say that it is both noisier and thirstier than the 1.3 I have driven as a rental car before. My overall consumption is 10 % above the consumption of my previous car, a Citroen C4 Picasso HDI, while the 500L has considerably less weight, so I am not 100 % ok with Luigis fuel consumption, honestly. It is great to drive however, lots of torque, even from low rpm where the C4 was very weak.
Brandy