Just a little opinion from a spectator's point of view...
Take it FWIW... but mostly constructive...
It seemed to me and others around me like the track lacked continuous action. There were allot of dead spots, when the track just sat there. Empty.
LONG periods of emptiness.
Not even a tumbleweed race to keep us interested. Maybe it was the venue, i don't know. But if you expect this sport to grow, the track has to stay busy for the spectators to stay interested. When trucks were running, the action was great, but the longer the track is quiet, the more time a fan has to reconsider his or her time in "participating by viewing", which may result in an empty seat next year.
I'll admit I did not run in the "Test and Tune" category like I wanted. I was busy BBQ'ing ribs, chicken, burgers, etc. for the group I went with. But even if I DID participate and run my truck, it wouldn't have made a dent in the dead time of the track.
It would seem to me you guys need to consider something to keep the track busier... otherwise, people will not come back next year. People come out to see diesels running down the track. If the action is non stop, they are more likely to come back next year, and you will have a bigger fan base to build on.
Even if it's watching 14-16 second trucks race, it's better than an empty track from a spectator's point of view.
I don't pretend to know your business, but maybe enticing amateur diesel enthusiasts to participate to fill in the gaps between the "main event" would help.
The venue doesn't have to make it "free" for everyone to generate more interest to fill the track to get this... perhaps something simple like the first 100 Diesel trucks in "Test and Tune" run free would do it, and a lower price for all those after that would work.
It's just a suggestion, I'll leave the details to the bean counters to work out.
I guess we'll see next year if your strategies from this year yield you more or less spectators, or if this sport is destined to die on the vine.
Good luck!