I have first hand experience with my totalled car from a HPDE accident. I was covered completely, settlement was fair and the adjuster worked with me to reasize a realistic value for the car, plus a cheap buy back for the salvage.
When I first spoke with my agent, and the in-office claims person I was very straight forward describing the event as a Driver's Education on a closed, private course. The claims person even said he was thinking a performance driving course would be good for his daughter who was just turning driving age. I specifically did not use the words 'Race track', because I was not racing. I told them there were instructors, I had an instructor in my car for the first session of the day, even though I was alone when the accident occured. There was never any question about why I was there.
When the adjuster came and looked at the car, he noted the many modifications done to the car, he worked at getting higher value for me and was able to inclease the value to $41,300 with out having to get into any real arm twisting, plus a $5800 salvage value. The adjuster had just bought a Porsche C4 and is getting ready to start tracking his car, so he was very understanding of the situation.
I think I might have had as good an experience as I could ask for. From accident to check in hand was 5 weeks.
The wording:
Sustained while operating or occupying a vehicle in any prearranged or organized racing or speed contest or in practice or preperation for any such contest.
Is very specific, HPDE does not fall into the description unless you are in a driving school where you are earning a racing license.
In the end I told the insurace company 'I guess I really needed the education, seeing how I crashed my car!'