Multi-turn user requests:
user: I would like to increase the amount of fuel in my car to completely full, but first I need to ascertain the present level to determine the appropriate amount to add.
user: The current fuel level is 39.5 liters.
user: Assuming the fuel level is now satisfactory, proceed to activate the engine using the 'START' function and verify the tire pressure to ensure it is in optimal condition.
user: Should I notice that my tire pressure falls below 40 psi, kindly provide me with directions to the nearest tire service center for prompt resolution.

Tools involved: VehicleControlAPI
Expected function-call sequence: VehicleControlAPI.displayCarStatus
VehicleControlAPI.fillFuelTank
VehicleControlAPI.startEngine
VehicleControlAPI.check_tire_pressure
VehicleControlAPI.find_nearest_tire_shop
VehicleControlAPI.set_navigation