I posted this in the other MPG thread, but I'll add it here.
(Wish the Admins would combine into just one "What's your MPG?" thread)
Did my second tank fillup today, and first where I knew how it had been filled previously. Squeezed in as much as I could both times. (Yes, I know this isn't a good idea to do regularly) This last tank I did lots of freeway driving at 60 MPH and some State highways at around 50 MPH.
340 miles, 6.417 gallons.
52.98 MPG! 4.44 L/100KM 
Better than I thought I'd get.
I don't anticipate getting that all the time, but it looks like mid 40s should be regularly attainable. I'm a very conservative driver when trying to get good mileage, and the ScanGauge is great feedback during the process.