I'm not sure if it will be of any difference, but the gasoline aditive is Ethenol, not Methenol. The problem with alcohol is that it will absorb water. If your gas sits over a long time, more than a month, you should put some stabilizer in it.
The other option gas makers have for an aditive is MTBE. It won't absorb water, but it never goes away if spilled! I like the choice of Ethenol much better. Besides the fact that I am a farmer and a lot of my corn goes to make the stuff.