For those that have been wondering about the 16/19 conversion, I recorded some tyre wear numbers from last weekend's VORTEC Champ's that you might find interesting.
Front Right Started/Finished: 58mm - 56.8mm
Front Left Started Finished: 58mm - 56.4mm
Rear Right Started/Finished: 63mm - 60.2mm
Rear Left Started/Finished: 63.5mm - 58.8mm
We used Sato tyres 37F/40R. Traction was good and the track is a large flowing one and runs clockwise. The main was 30 minutes.
My driver likes to use brakes to have the rear end move out on a couple of the hairpin turns, so we tried to anticipate this somewhat in terms of tyre wear.
This all worked fine, but it just might have been better using 40F/42R.