@ that moment 1 liter every 8 km. (1 liter per 4,9 Mile)
Due to a cancelled flight, my son was stranded in Luxemburg.
On the way home... we went through Germany (no speedlimit there)
In Holland there is a 100km/hour speedlimit, after 19:00 hour on some tracks it's 130km/hour until 6 oclock next morning