How many people really know how to use a fire extinguisher properly even if they had one available? Most people I know would aim at the flame instead of the base of the fire where the problem is.
The government agency I work for has put small 2 1/2 ABC extinguishers in the company vehicles for the 30 years I have been there but there have never been any training courses on how to use one properly. I take a car out once once or twice a month for an hour or two but we have on call people taking a vehicle home every night.
My neighbour on the other hand had to go on a manditory course on how to use one before they let him drive a company vehicle. Even our fire department traing devision does not promote traning and they have a half million dollar training center for this.