Those automatic cars are never going to get close to the mileage of a manual.
My 2013 Passat has done several 900 mile tanks already (mostly freeway). I was tempted several times to shoot for 1000 but the gas stations tend to be far apart where I get those mileages. I keep the speed around 65 during the day and 55 or 60 at night (paranoid about hitting a deer). Mild hypermiling...
I managed 1000 miles a couple times on my '97 Passat wagon, but on one of those I literally coasted into the gas station, and the other time I had to get a can to refuel.
Also was driving pretty slow; each increase of 5mph caused my mileage to go down about 5mpg (US).
I suppose it matters if you top off on the fill too. I don't; just stop at first cut-off on a low speed fill.