6,000 rpm? That is a high engine-speed. It will more likely seize as the oil thins out due to the high level of heat produced, before the fuel runs out. You don't say how big the engine is, nor what car it is in, what roads it is travelling on, in traffic or not? How much does it weigh?
Not enough details.
Unnknown. Depends on:
Engine displacement
Diesel, gas, hybrid?
Rate of consumption.
Load on engine?
on my bugatti veyron 16 gallons at 6k 9.33 minutes
I would take a guess at 3 hours.
don't know. why don't you try it out and time it. And let us know.
Constant 6k rpm with 16 gallons in the tank. How many minutes or hours will the the car run out of gas?