18 Gal. I have this car myself.
I own a 1999 Pontiac Grand Prix and it has a 17 gallon tank. Read the cars owners manual,....it lists everything about the car in there.
P225/60r16
36mm
P225/60r16
225 60 r-16
The tire size for the 2000 Pontiac Grand Prix varies slightly with the model of the vehicle. The average tire size is 225/60 R16.
the size is on the side of the tire
225 55r17
When filling an empty gas tank needs to be filled, it is important to know the tank size. The size of 2009 Pontiac grand prix gas tank is 17.5 gallons.
P225/60r16
P225/60r16
15 gallons
Give more detail what year of grand prix do you have what model grand prix do you have what is the engine size does it have abs