A tampon dunked into the gas tank of any vehicle at hand accompanied with anything that will make a spark.

That or a road flare are the last ditch "Oh my god I need a fire now." options.

Other then that, just peruse the boy scout handbook and you'll see the ways I learned to make fire and they have rarely (if ever) failed me.


edit:

the added benefit of carrying tampons as fire starters is you can use them for wound packing if the need arises.