Porsche Panamera Owner's Manual page 268

Refuelling
Danger!
The RF energy from a cellphone can cause a
sparking on bare metal, much like aluminum
foil in a microwave oven. The spark could
ignite gasoline fumes present while refuling.
Static discharge from your body can ignite
gasoline fumes present when you get back
out of the vehicle and touch the fuel nozzle.
In either case, resulting fire can cause
serious damage to the vehicle, serious injury
or death to persons in immediate vicinity.
f Do not use a cellphone while pumping gas.
f Do not re-enter the vehicle while pumping gas.
266
Maintenance and Car Care
1. Stop the engine and switch off the ignition.
2. Open the filler flap by pressing on the rear part
of the filler flap (arrow).
The vehicle must be unlocked.
3. Slowly open and remove the tank cap.
Put the tank cap into the holder (arrow).
4. Add the fuel additive recommended by
Porsche if necessary.
5. Insert the pump nozzle fully into the filler neck.
The handle of the pump nozzle must point
downwards.
Total capacity:
Panamera S: approx. 21.14 US gallons
(80 liters).
Panamera 4S/Panamera Turbo:
approx. 26.42 US gallons (100 liters).
The reserve is approx. 3.96 US gallons
(15 liters) for each.