Glad to see that I've been vindicated and special thanks to Olstoney for posting the comparison photos. As to how I've dealt with this problem, I went back to the LHS that sold me the PM fuel and presented my findings. The store owner, a very reputable man who I've bought from for over 20 years, without hesitation insisted that I take a FREE gallon of fuel to make up for the POWERMASTER shortage. Furthermore, he discounted his remaining stock of PM fuel so as to not short future customers. Needless to say, he will continue to get most of my business along with great word of mouth advertising.
And to POWERMASTER(Laura) if you're reading this, I think that you have a great product and salute you for taking action to make things right. I am whole but my LHS is the one who took the hit (and heat!). If you'd like to square things with him, send me a PM for the store's name and number.
Final thought: I will continue to buy POWERMASTER fuel if my LHS continues to carry it.