Multi-turn tool-use scenario.
Tools involved: VehicleControlAPI
MathAPI

User requests (one per turn):
user: You're planning an extended expedition from Rivermist to San Francisco.
user: I should be more clear. I mean could you determine the travel distance between these two locations for me?
user: Next, I need to verify if my car's mileage capacity suffices for the journey. Can you assess if the vehicle can handle the calculated travel distance?
user: It seems I've discovered the tank isn't full. Could you be so kind as to facilitate refueling the vehicle fully for such a lengthy trip?
user: With the tank now replenished, let's confirm our readiness for departure. Please secure all doors and initiate the engine for me.
user: As the vehicle's prepared, let's delve into evaluating some fuel efficiency statistics via the mean of these travel distances: 750.0 km, 320.0 km, 450.0 km, and 290.0 km.

Expected function call sequence:
VehicleControlAPI.get_zipcode_based_on_city
VehicleControlAPI.estimate_distance
VehicleControlAPI.estimate_drive_feasibility_by_mileage
VehicleControlAPI.fillFuelTank
VehicleControlAPI.startEngine
MathAPI.mean