I would not lose much sleep over fires in small planes. Consider the likelihood of having any accident being very small, then consider that less than 5 percent of those rare GA crashes result in a fire and the risk is pretty low. Then remember that there is a good chance that you will probably already be dead from being mangled to pieces should you have a serious GA crash so flashy suits are kinda useless anyway.
You are better off preventing your burns by making sure you fly safely and not crashing in the first place. The rest will work itself out.