Now that everyone is thoroughly confused . . I'd recommend that you get one, but talk to someone who actually knows something about them - like a fire department or fire extinguisher vendor (not the kid at Walmart). There are obvously conflicting opinions here. You'll have to consider some tradeoffs; effectivity vs. cost vs. potential mess vs. potential for firing the thing off while you are still in the car with the doors closed. Dave Swingle - Moderator