Not unless it is a Flex Fuel vehicle. Read your owners manual.
No. A 1999 Ram is not equipped to run on E85.
Not with out damaging the fuel system.
No.
If the car is a Flex-Fuel vehicle then yes you can use E85. If it is not a Flex-Fuel vehicle you cannot use E85. Using E85 will damage components. As far as I know your 2006 Pontiac G6 is not a Flex-Fuel vehicle. Reads your owner's manual to be sure.
The 2012 Dodge Durango runs on flex-fuel (unleaded/E85).
If it is a Flex Fuel vehicle, YES. If not, NO.
The 2013 Dodge Grand-Caravan runs on flex-fuel (unleaded/E85).
The 2014 Dodge Grand-Caravan runs on flex-fuel (unleaded/E85).
The 2012 Dodge Grand-Caravan runs on flex-fuel (unleaded/E85).
The 2010 Dodge Grand-Caravan runs on flex-fuel (unleaded/E85).
Maybe, if it is a 2.7L and there is a E85 sticker inside the gas door. If not no, it would damage the fuel system.
The 2006 GMC Yukon-XL runs on flex-fuel (unleaded/E85).