So 4-5 cars min, 10 max, and it's 500 or 600 per car, plus whatever the per-hour dyno fee is?

So if 4-5 cars are tuned in the same day, assuming a 10 hour day that's 2 hours max per car for tuning, minus setup/changeover time for each car. So that's somewhere between $250 and $300 per hour (plus the per-hour dyno time) to get a tune.

If 10 cars are tuned in the same day, assuming a 10 hour day that's 1 hour per car max for tuning, minus setup/changeover time for each car. So that's somewhere between $500 or $600 per hour (plus the per-hour dyno time) to get a tune.

Tuning is mostly just labor and amortized software license costs, so that still doesn't seem like a great value. I don't really understand the flat-rate tuning concept for something which takes a highly variable amount of time from car to car.