In fairness...
I believe him... i rekon he could have used his napper a bit more in order to slow/stop the car, but even if he was speeding and tried a fly one to get off with it, i dont think he would have the guts to go through with a 100mph crash?
He'd poof it and "somehow" slow down before he had to crash in my opinion?
So i rekon there was summit up, and he just didnt think properly about how to stop the motor.