2008 OBS Auto at about 500 miles => just under 18mpg for city driving.
That's cuz you have Canadian miles, which are much smaller than our manly USA miles, so you get less. Sorry.
Dude in the OT forum told me that, and they know their stuff.
Oddly though, my mileage * 0.62 = your mileage.
If I reset my trip-o-meter, then set the cruise for 100kph, I get 28.2 MPG steady-state w/ crappy Oreygun corn/gas. If you get substantially less, may want to have it checked out.