Yes, I would hypermile a Veyron.
I hypermiled once or twice with all the cars that I have owned, just because I’m curious and saving gas is good. I hypermiled my 5.5L V-8 Mercedes once and got 25mpg; I also had the indicator show 26mpg which was probably correct based on filling up. I also kept to the 68mph speed limit; didn’t go slower or faster. When I had the Prius C I did the exact opposite once, I wanted to see what the fuel consumption is going as fast as I possibly could doing the same trip. I was doing 75-87mph the whole trip and once I topped out at 100mph going downhill (this was limited by air resistance and the 99hp combined power). I got 42 (s)miles per gallon. I think hypermiling a Veyron would not change the fuel consumption much; the 16 cylinders are constantly getting fuel and the engine is grossly under stressed at any speed around the speed limit.
Also, I would never buy a Veyron, although I’m glad it exists. They are already working on the Bugatti Chiron, the successor to the Veyron:
https://www.youtube.com/watch?v=FjNHVf08VZg