I have a new car -- a boring sedan, not a sports car. No, not even in an exciting color. But I'm thinking I should have a fire extinguisher in case things go south. Or in case I see a car on fire by the side of the road. I looked up Amazon, and they have fire extinguisher of various sizes:

1.4 lbs
2.5 lbs
5 lbs
11 lbs

How much do I need? I'm inclined towards the 1.4 lbs, because I don't have that much space in the cab. (Yes, I'm going to find a secure way to mount it to something sturdy. I won't leave it around so it could turn into a cannon ball in a crash.) Would 1.4 lbs be enough "for most situations" in a car fire?