Originally Posted by Chris Shunk @ AutoBlog

The Pontiac G8 Sport Truck was originally supposed to be powered only by General Motors' 361-horsepower 6.0L V8, but tough fuel economy standards and customer demand for fuel efficient products have conspired to change the General's plans. Edmunds Inside Line quotes an anonymous senior engineer at the General saying that the unique sport ute will receive automaker's 3.6L V6, as well. That's good news for fuel economy, but the better news is that the 3.6L V6 of choice will be the direct injection versoin. That will likely give the G8 ST the same 300+hp as the 2010 Camaro and Cadillac CTS. That should also make the base ST more appealing to enthusiasts and the average Joe, with more power at the pedal and a healthier torque curve. The DI version of GM's 3.6L V6 will also likely be available in the base G8 sedan for the 2010 model year, as well.

It makes sense that GM would go with direct injection for the G8 ST, as the General has already promised the powerful V6 for the Chevy Traverse and Camaro. Putting DI in more vehicles will help drive down the cost of producing these more high-tech engines economy of scale while also giving customers V8ish performance with V6ish fuel economy. Keep in mind, however, that though a GM engineer was quoted, none of this is official word from GM, so plans could change.

[Source: Inside Line]