Fuel consumption varies much depending on which kind of trips one are driving. I think the factory numbers fits quiet well to what I have experienced driving my Journey R/T 2,7 V6. Daily use forth and back to work average usage E85 15,3L/100Km a roundtrip 82km with speedlimits 40, 50, 60, 70, 110-120kph. With short trips into city it kan quiet quickly raise to 16-17L/100km.
On normal gas the numbers are 12,7L/100km forth and back to work and with short trips 13-15L/100km
Best results are when I travel longer trips off course then I normaly use regular 95 and I can drive 9,4L/100km which I think is quiet good. And that is with speed limits between 50-130kph.
And my Journey are one and a half year old and until now has passed 38000km