The time it takes for a gas tank to rupture and explode is certainly longer than the time it would take for a wildland head fire to pass through. I am not saying that one should remain in the vehicle for an extended period of time. In most instances, the fire will pass in 30-60 seconds. The vehicle acts as a temporary shield from the intense heat. Once the fire front passes, the remaining fire is quite survivable. The smoke has now become your problem. With a moderate breeze, this too shall subside rather quickly. I would hope that this never happens to anyone on this forum. Just trying to lend some advice that may save someone's life.