I used some of the funky dash features on my new car yesterday to gauge my average speed and fuel consumption on the way to and from work.
On the way to work I averaged 38.4km/h with fuel consumption 11.5L/100km. On the return trip (which included the dreaded dual pickup of kids) it was 38.5km/k and 11.2L/100km.
This morning I started work at 04:00 and averaged just under 70km/h with a consumption of just under 10L/100km. I think I might start work at 04:00 more often ....