It's too early to tell, but it does appear that the Pat's smoke fluid is longer lasting than the Mega-Steam that I've been using for some time. I ran my two U-Boats double-headed until they needed fluid, then filled one with Pat's and the other with Mega-Steam. The Pat's clearly lasted longer, interesting test. 
Just received my Free Sample from Pat's Trains! Thanks Pat!
Pat, I will try it this week and advise of the results.
And thanks again in a indirect way, the Grape Scent makes me want to go see if I can find a vendor selling grape snowcones! Sorry I regressed to a childhood memory that now I can not get out of my mind or nose! LOL
