From "Firefighters tackling a Tesla blaze in Austin said they had to use 40 times more water than for a regular vehicle fire because of the car's lithium battery cells"[1]:

> "Normally a car fire you can put out with 500 to 1,000 gallons of water," Austin Fire Department Division Chief Thayer Smith said, per The Independent, "but Tesla's may take up to 30,000-40,000 gallons of water, maybe even more, to extinguish the battery pack once it starts burning and that was the case here."

Fire engines in my municipality have ~500 gal tanks.

[1] https://www.businessinsider.com/tesla-crash-fire-lithium-bat...