Did a full EV calculation for SpeedDrift.

Level 6 gives the best tokens-per-bucks ratio.

Level 7 and 8 look tempting because of 1500/3000 rewards, but the spin costs explode and kill efficiency.

Even factoring refund and +500 bonus mechanics at levels 5–7, Level 6 still wins.

If you're optimizing value rather than chasing max payout, 6 is the sweet spot.

T = stop level.
Spin until you reach level T, then collect immediately.

T Expected Tokens Expected Cost (₹) Tokens per ₹ Std Dev
1 4.35 60.00 0.07250 3.46
2 13.01 178.58 0.07285 10.94
3 42.94 545.80 0.07868 31.85
4 127.91 1562.11 0.08188 69.75
5 315.83 3595.51 0.08784 167.58
6 768.50 8588.83 0.08948 391.30
7 1762.00 20173.37 0.08734 564.67
8 3018.00 34554.17 0.08734 94.70