Me and my friend will cruise I-95 and route 8 here in Connecticut regularly at around 140mpg sometimes 150mph. I'm in my Porsche and he's in his twin turbo Lotus esprit. What we do is give each other a lead of a mile and we'll have our cellphones on with headsets.

If he spots any cops while in the lead he'll let me know and vice versa. we take turns doing this in the summer.

Of course if there is traffic we don't drive like this.