If you want better gas mileage do Not buy the QX60 Hybrid.
I bought one in December 2013. After a few weeks of poor gas mileage and noticing that the Hybrid engine seemed never to be running, I took it to the dealer.
The service guy told me that the Hybrid engine by design does not work when either the AC or heater is on! That's 99% of the time that I will be driving. Total nonsense. I paid an extra $3,000 to get the same gas mileage that the gas only version gets. There was absolutely NO disclosure from my salesman about the "unique" way this hybrid engine works, or more accurately does not work! No one would ever pay the extra $3,000 if they new the truth! I feel totally robbed!
Infiniti needs to pull the plug on this "hybrid" until they design one that actually works!