if i read what rc guy is saying the Wren is eating 4.2 oz fuel per minute giving 8 lbs thrust, if its a simple math product (which i doubt) it sould eat 3.1/oz of fuel per min at 6lbs thrust, but i KNOW its not that simple of a calculation... i would assume there are other factors to weigh in. like load/rpms at 6lbs. fuel/ set up. how efficent the bur is, ect... will all effect fuel per min consumption.....
but i have NO turbine experience, im gettin learnd! lol. but the logistics are there, i just dont know how to arrange them to get the numbers your seeking.
Tim