Multi-turn user requests:
user: I'm cruising down a country road in my brand-new convertible, admiring the scenic lavender fields when I notice the fuel gauge creeping towards empty. I'd appreciate it if you could refill with some gasoline to keep the adventure alive.
user: Sure, the amount needed is 10 liters.
user: Now that the tank is replenished, let's fire up the engine with a swift ignition and take a peek at the dashboard stats, particularly the fuel level and battery voltage before we continue our picturesque journey.
user: Before we venture further into the rolling hills, I'm keen on ensuring the tires' health is up to standard. Could you check the current tire pressure for each one and let me know?
user: To wrap it up, let's calculate the average tire pressure to make sure everything's in tip-top shape.

Tools involved: VehicleControlAPI
MathAPI
Expected function-call sequence: VehicleControlAPI.liter_to_gallon
VehicleControlAPI.fillFuelTank
VehicleControlAPI.startEngine
VehicleControlAPI.check_tire_pressure
MathAPI.mean