Modern fuel injected vehicles use an electric fuel pump mounted in the tank.
The fuel pump is cooled by the fuel as it passes through the pump. Guess what can happen to the pump if it runs out of gas. You got it - The fuel pump can be ruined.
I never run my vehicles lower than a 1/4 tank of gas because of this.
One thing for sure... I'd make sure it had about 10 gallons of gas in it before I took it to the dealer.
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."