This is my commute, from home to work, left to right (this is such a great toy!).
I don't have a fuel economy readout (OBD1), but I guess it's obvious that, although I don't use much fuel going to work

I use double on the way home
An observation: It doesn't seem to show the actual road height when crossing bridges.
Look at the small dip just after 29.4 km. That's the Nepean River, not the tall bridge that crosses it.
I wonder if it's also reading wrong where the road goes through a cutting?