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Many others have commented on this; my addition is for your backseater......first alert tundra fire extinguisher spray.
$12 at most big box stores, I've got one in every vehicle and cooking area in the house.
I think simple is best, even with accidental discharge, this one will not cloud your vision, contaminate the air you breathe, or corrode stuff ( as far as I can surmise). cleanup easier.
Yours should be a B,C at minimum....I have a 1 lb within reach, and a 2 lb in the baggage area for engine fires while on ground.
Halon is likely superior in almost every case, but that's another discussion on it's own!