Average speed, both during a fixed number of last minutes and during a trip should be very valuable. I guess most people of today´s crazy world are too concerned about saving time all the time. What I hope to see clearly is that lowering the highway speed with say 10% will make no significant difference at all in time but definitely in spended money on fuel.
Since I have a 37 year old car I like a lot I don´t want to ruin it by speeding. My experience tells med that I often catch up with the over-stressed losers when I get into town even though I drive about 20% slower than most people on the highway. By "reading" the traffic and planning my driving I may even pass the poor losers eventually! -And that while saving a lot of fuel! Now I just want to se this proven by figures too!
-And to improve my driving even more.