I like the "I didn't know I was being pursued" angle.
at that speed, i can't imagine being aware of much of anything other than the skin on your face being blown back.
A cop once followed me for nearly two miles before I finally looked into my rearview mirror and realized he was there. I had just gotten news that I was about to be laid off from my job, and my mind was completely elsewhere.
In my younger days ... I had a hot rod Corvette and did drive at those speeds on backroads ... it is very easy not to know that one is being chased.
I used that line 25 years ago - without success. :)
Maybe I missed it, but did the guy still get the ticket?
This is probably different because the guy was going really fast in this case, but it can happen. My mother-in-law once had a police officer trying to pull her over for twelve miles. She was very tired and had not noticed the lights behind her.