What platform was used to build both both the midsize Pontiac G6 and a compact executive car manufactured by a Swedish automaker?
Pontiac G6: The Pontiac G6 was a midsize car that was produced by General Motors. Pontiac G6:  The car was built on the GM Epsilon platform which it shared with the Chevrolet Malibu and Saab 9-3 along with other General Motors vehicles. Saab 9-3: The Saab 9-3 is a compact executive car that was originally developed and manufactured by the Swedish automaker Saab.
GM Epsilon platform