I filled up on Saturday and was pleasantly surprised with a 70 MPG tank!
3.36 L/100 km = 70.6 MPG US over 702 km / 436 miles.
I honestly wasn't expecting it -- it included the above-pictured 50 MPG trailer run to get rid of brush & branches. The SG said 66 (not quite dialed in, obviously), but the factory gauge said 3.4.
Driving conditions were pretty ideal this tank: hot & dry, and not too windy.
It was my usual summer driving routine on lightly travelled back roads with max posted limits of 80 km/h / 50 mph (most of the time on cruise control, tapping speed up & down for hills). Also includes going through a bunch of little towns & villages where I get lots of opportunities to bump up the MPG average with EOC to stops & turns, etc.
This was my first time cracking 70 (for a tank) in a Mirage. And that'll be this year's high water mark for the car - I'm going to park it soon and put the MPGiata back on the road until mid-fall.