Geez....that is incredibly dumb. On a racetrack? Fine. Public roads? Unquestionably risky.
I knew that would raise the tut-tuting...
It's risky on a racetrack too. Which we ride regularly. We're not talking an Interstate at rush hour. Never around any other traffic, or witnesses... Just a spirited ride out in the country. You can't do those speeds for long, as gas mileage plummets, and you risk running out of gas before getting back to civilization.
To give you an idea, it takes a matter of seconds to get from say 70 mph to in this case 168 mph, on any of our bikes.