going through all the testing of the meth imo is a little much lol. The meth I get comes straight from a chemical company in a sealed glass container.
While I agree that the mixture should be done by weight, most people arent going to sit there and weigh their mixes each time. mix it by volume, get tuned and continue.. then there is no concern
When you start talking all this "tech" info I feel that it may scare most users from using meth/water mix. A lot of tuners wont tune a meth car to its full max just as they wouldn't with a gas tune, for safety's sake. If you are planning on tuning your car yourself and/or want to squeeze EVERY last drop of power out of your set up, then I can see by going through the above methods for measuring, weighing, etc etc.. But for the common user its a little much