cylinder on demand and shut down of alternaiting banks of 4 are the reason behind the combined 28mpg i know of some reviews where they claim a 32mpg on a run at 70mph it will run with only 4 cylinders 1 turbo and a 2L out put and will stay like that until sufficient load is put on the engine to kick in the other 4
exelent idea and should be implimented on the W12