This was actually last Sunday night, during my usual weekly commute from the High Country back down to The Valley.
10pm at night- no traffic, US 421 which is straight, nearly flat, two lanes in each direction, nice median and 65mph speed limit.
I'm cruising in the right lane doing 70, which is 5 over- my usual. Headlights approach behind me in the distance and a Mecedes SUV passes me on the left very quickly. I'd guess he was doing 75 or more, maybe 77. He switches lanes and gets about 10 seconds in front of me, then he slows down.
I got the cruise control on, still 70, and I slowly start catching up to the guy. About two minutes goes by and now he's three seconds in front, then two. So I switch to the left lane and "tap up" to 72. This is about my max because I know that the cops here let you slide at 7 over. The Merc speeds up a bit so I tap up two more, and I pass him.
Merc then speeds up and hangs in my blind spot. This goes on for a minute or so so I tap up two more, now I'm doing 76. Merc again matches my speed, and hangs in the blind spot.
This goes on for about 5 minutes. Finally Merc speeds up to 85 or so and passes me and keeps on going. Good riddance dbag.