A tire pressure monitoring system for a vehicle has bleed and refill pressure thresholds in addition to high and low pressure thresholds. If a tire pressure remains at a level below the refill pressure threshold and above the low pressure threshold for a specific period of time, based on amount of deviation from the refill pressure threshold, a refill alert is generated. If a tire pressure remains at a level above the bleed pressure threshold and below the high pressure threshold for a specific period of time, based on amount of deviation from the bleed pressure threshold, a bleed alert is generated.