Yes, use only 87 octane regular. Using any higher octane is a total waste of money and provides no benefit whatsoever. The only engine that needs a higher octane fuel is the GT which had a Yamaha designed engine. it does require premium fuel.
regular... octane 87
The Pontiac Vibe GT with the (1.8L 4cyl ) requires Premium Unleaded. The use of Regular Unleadedmay lead to predetonation or what is commonly called pinging. Although you may not be able to hear it, itmay be there. The Vibe's fuel/air managment system may be able to adjust for the regular fuel somewhat but at a cost of mileage and power. The engine requires Premium fuel, so burn Premium fuel. Burn Regular Unleaded and you risk engine damage.
This depends on what options a 2007 Pontiac G5 is equiped with. You could probably find a used 2007 Pontiac G5 for anywhere from $9,900.00 to $11,000.00.
If it is a Flex Fuel vehicle, YES. If not, NO.
To find a 2007 Pontiac Solstice, check out local used car dealerships that sell Pontiac's. Or, one could look on a site such as AutoTrader and see if one is available through them.
I have used regular for years with no problem.
Regular Unleaded, Premium fuel is not required.
OEM is AC/Delco
The 3.8 liter V6 and the 5.3 liter V8 engines used in a 2007 Pontiac Grand Prix both use a timing CHAIN
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.
In the United States, unleaded regular gasoline is the most frequently used fuel in cars and small trucks.
The fuel tank size on a 2007 Kia Optima is 17.2 gallons. The price for a used 2007 Kia Optima starts at $5,993 from a dealership.