It depends on battery capacity: 4,000-4,500 mAh (Woscher, Amazon Basics): From low pressure (10-20 PSI): 2-3 tyres, may need recharge. Quick top-ups (add 5-10 PSI): 3-4 tyres comfortably. 5,000-5,200 mAh (Qubo MAX): From low pressure: 3 tyres reliably, possibly 4th tyre. Quick top-ups: 4-5 tyres comfortably. 6,000 mAh (TUSA Storm X, Portronics Vayu): From low pressure: 4 tyres reliably, possibly 5th. Quick top-ups: 5-6 tyres comfortably. Pro tip: For full car inflation from flat (all four tyres 0-35 PSI), use wired mode for fastest completion without battery worry. Reserve cordless mode for convenience tasks (1-2 tyre top-ups, bike inflations).