Must just depend on the dealer, and your overall location.
When I bought my '07 Nissan Altima 2.5S back in December '06, the dealer filled the tank before I drove it off the lot. I had to turn around and head right back, because they forgot to put the temp tag in the window. And then, the next morning, the CEL came on because they didn't tighten the gas cap enough, but that's a mild inconvenience for a full tank of gas.
Then a couple weeks ago when I bought my 2011 Mazda RX-8, it came with a full tank of gas.
I've also bought or been involved in the purchasing of 5 new motorcycles between 2006 and 2009, and only the 50cc dirt bike didn't come with a full tank of gas.
Just depends on the dealer, and the area you live, if they are going to go the extra step to ensure a happy customer.
BC.