(Bleeding Edge SDL) More Fire Wonkiness

Getting some weirdness with gasoline fire spread. I accidentally went full-auto with an American-180 too close to my car, which had a full gas tank that was promptly shot to pieces. Being rather bored, I also shot up the nearby gas pump and lit fires in two separate places on the edge of the considerable puddle of gas. After doing so, I noticed that not only were they remaining as small fires, but they were not spreading at all and eventually went out, though there was a small explosion on one of the tiles that effectively did nothing.