Wii?!?! Oh come on!
I just drove my 2003 Mugen Civic Si around the Nurburgring to see how long it would take for the fuel to run out. It took about 4 and a half laps! After your fuel runs out, you start misfiring and then the car just starts to slow down and you can't power up. Anyway my best time in the Civic was a 9:53 around the nurburgring.

I checked up how big the fuel tank is and how much i traveled (i figured it to be around 55 miles:P) and I was averaging 4.15mpg!
According to this, the hummer wouldn't last more than half a lap on this track!