I would like to see an endurance road course test for tires.
Take the current crop of best tires and run them on your Miata at the racetrack during a race.
Which ones wear better? Which ones get greasy with heat? Which ones heat up more? Which ones recover the fastest? Which ones provide the most grip (I think this could be accomplished by looking at 2 or 3 corners of data, not the entire lap, and compare those corners across the entire group of tires).
Doing your regular race and changing tires every other pit stop or every 3 pit stops might be enough data if you run a data recording device.
For the test results, note the following pre-test:
Tire pressures (cold)
Weight on each corner of the car
Camber
Toe
When the tires come off, note the following:
Tire temps (IOM)
pressures
wear - if possible objectively
Ask for any subjective info from the driver.
After the weekend, look through the data and you can add highest sustained"G" through the chosen corners to the data as well as lap time (because people like lap time).
This is what we did about 2 years ago when the really fast tires starting coming out. We found the best combination of wear, drivability, and grip that worked for us. We tested RS3 v2, Toyo R1R, Rival, and Star Spec Z1. The rival was the best for us at the time, but we also found out that you MUST heat cycle them once or you will destroy the outside edge of the tires.
We have not had the opportunity to do this test for the newer tires due to cost and time (4 babies have joined the team since we last did this test).
That's my .02$.