Driving in Mexico last night on Rt 4 east, towards Upper Marlboro, I finally found some open road after dealing with left lane hangers. Not long after I took off, I noticed another vehicle not far behind me. So I punched it again. The vehicle still stayed with me, not on my bumper like they were able to overtake me me, but enough to say that were keeping up. Got pretty fast, too, I must say, and at points I was able to create some separation between us but not by much. I will also say that I didn't drive flat out, pedal to the floor either (I'm not crazy, lol) but pretty darned fast. Eventually the vehicle exited off to Rt 301 north. Never did get a real good look at it (it was always behind me, lol), but I did notice the headlights were those LED type that are on Audis. Can't say for sure it was an Audi, but if it was and depending upon which model (S, RS), it could probably keep up. Besides that, I'm not sure what other high performance vehicle has these LED headlights, which AREN'T shaped in the traditional round type, but more like an irregular rectangular shape. Anyway, I would say this was the first time since owning this G8 beast that I've had anyone hang with me. Usually when I punch it, that's it, game over, but this person was able to keep up.