I used to get anywhere up to 11.5 mins out of a Modified Rody V.12 in a Mugen MTX 3 , With an ofna 2 chamber pipe 75 ml tank 16 % nitro .. This was on a short track with limited EPA on the throttle .. The Pipe was modified too , i milled the stinger and drilled the baffle out ... But the pipe was ok , i used a couple of Nova pipes and a Sirio one .. I wanted to try the Skyline and Mugen pipes ,, they seemed to have the goods re power ... Mind you i leaned the engine to within an inch of its life , got a bit over 18 litres through it and it still runs ...