A couple of things. Strato charged engines work by using a unique port layout that sets up a "slug" fresh of air in between the incoming fule/oil/air mix and the exhaust. This air is then used to blow down the cylinder(scaveng). This intern reduces the all important unburnt HC emmisions,virtually eliminates smell/smoke and saves alot of fuel.
As far as consumption goes, I do not have any hard data. The only thing I can say is that the Redmax blower I have will run a very long time on a tank of fuel, Probaly twice as long as the Stihl BR-420 it replaced and the Redmax has a bigger motor to boot.
Now doubt the next generation of Strato engines from stihl and Husky will be better than the ones we are eeing now. At least the Stihl 441 doesnt have a rev limiter like the 575.
BTW one more thing for you guys to consider. A starto engine has much less oil going through it than a regular two stroke and runs hotter so oil quality is very important. The guys using outboard oil will get themselves into trouble quick with these engines.