The 764LR will be powered by the new engine under development by Engine Alliance (GE/PW), which will also power the 74X, A380. I have asked why GE and PW are teaming up on this, and the responses were to save money. Now I wondered why dosent Boeing just use an uprated P+W4000. The 4000 can easily handle the increase, its already powereing 777s and A330s. Why would they use such a powerful engine such as the TP7000?