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.
If it is a Flex Fuel vehicle, YES. If not, NO.
No, is the short answer. Only with modifications to certain hoses and components. Owner's manual list the fuels that can be used.
The 2006 GMC Yukon-XL runs on flex-fuel (unleaded/E85).
Not unless it is a Flex Fuel vehicle. Read your owners manual.
E85 is an ethanol blend of 85% ethanol and 15% gasoline. It is primarily used as fuel for flex-fuel vehicles, which are designed to run on a range of ethanol-gasoline blends. E85 is considered a renewable fuel source and offers certain environmental benefits, but its use may result in reduced fuel efficiency compared to gasoline.
The 2006 Pontiac Grand Prix is not E85 compatible. The easiest way to verify off hand is to check with either a website such as http://alternativefuels.about.com/od/flexfuelsffvs/a/e85compathub.htm or to locate the VIN number (generally in the driver door or door frame, or the driver's side of the dashboard through the windshield) and identify the 8th digit of the VIN which is the engine code, and call the local Pontiac dealership's service department and provide them with that information, as well as the size of the engine, and they should be able to tell you right away exactly what fuel your vehicle can run. But again, as my knowledge goes, the 2006 Pontiac Grand Prix is not compatible. I did however notice that some of the General Motors cars were indeed compatible, so you may want to go ahead and run your information past Pontiac directly.
No, but the vehicle has to be able to operate on E85.
It is not made for E85 it is just designed to be able to use E85. You can use regular fuel and it will get better fuel economy in the process.
Probably not. My 2009 Vibe won't run it and since the 2010 was the last year model, I doubt seriously that any major modifications were made to the Vibe. I believe all GM vehicles that run E85 have a yellow gas cap, and an E85 sticker on the inside of the gas door (and a FlexFuel decal on the car somewhere?).
NO! As far as I know the Vibe is NOT a Flex Fuel vehicle. If it is Flex Fuel and can burn E85 it will have a label affixed to the vehicle somewhere. Do NOT use E85 in a non Flex Fuel vehicle.
If you are referring to E85, from my experience using E85 actually lowers the fuel economy.
No. do not use E85 in a Liberty. It does not have the proper software or fuel system components to run on E85.