Actually both the GTO and G8 weren't that bad on fuel. My GTO will run about 23-24 highway and the G8 the same. The LS96 has the 4-cyl. fuel cutout under light loads which helps. It does show how good GM can be, although again, both those cars are Holden products with Bowling Green, KY engines. Pontiac apparently tried to save itself and produced two very fine cars in the process.