A lot of the stories seem apocryphal, especially when it comes to Yunick. He denies the gas tank story where he was informed by tech that he couldn't race because he had ten major infractions in the car. He looked at them and said "Make it 11." and pulled out of the tech station and drove his car back to the shop. The gas tank for the car had just been tested for volume and was sitting, quite empty, in the back seat.
If it was me, I wouldn't deny that kind of thing. I'd roll in it like a dog on the dead.