After a bit more googling
The Jeep blog itself says the 2011 3.6L is compatible with E85.
Strange I'd read other information that said it wasn't.???
I couldn't find any other reference to its compatibility in Australia anywhere else other than this blog post.
This doesn't necessarily mean the MY14 version is as there might have been some changes in the tuning or componentry / fuel lines etc.
It also seems this article from 2012 says that the 2012 Captiva 5 with 2.4L engine is OK to run E85.
The other one is the Jeep Cherokee (not the new KL version) but the one with the 3.7L engine.
One version of the Bentley Continental 6.0 W12 also can, but that s about it.
It doesnt seem to be too popular according to the article though.
Fuel for thought
The argument for running E85 is that obviously it uses less "fossil fuel" (of course being only 15% petrol), I can see the benefit in that as fossil fuels run out (eventually)
It also that it produces less CO2 emissions for the same energy.
That's true, it produces about 37% CO2 per kg fuel when burning compared to petrol but you would go thru about 35% more kg of it in a flex-fuel car to go the same distance so its only maybe 2% less CO2.
If the car is tunes specifically for E85 then it might be better but still only 2% to 10% less CO2.
The energy per kilo is less because there is quite a bit of Oxygen already in the fuel molecules and this accounts for some of the mass in the fuel.