I thought it was "standard operating procedure" for any dealer to always give a full tank of gas on sale of a new vehicle. I've only done two brand new vehicle purchases in the past ( one in '07 and one in '15 ) and in each case they fully gassed up the vehicle before we drove off.
I noticed on the POC it has a line item for "5 additional gallons of gas" and I asked Renae about that and she said, if I recall correctly, that's what the factory send and that they put an additional $30 worth into it. With their prices and service being so awesome I hadn't the heart to push the point, but in the back of my mind I was thinking "man, that's a bit lame" ! Although... if they filled every 33 gallon tank that left their lot, that would add up for them I guess !