General Motors’ Active Fuel Management system has been around long enough to earn both fans and vocal critics, and that split has created a simple but urgent question for buyers: which GM engines ...

We may receive a commission on purchases made from links. Imagine you could get all the brawny output of a robust V8 engine in your truck when needed, but also get improved fuel efficiency while ...

GM has been busy revamping its powertrain lineup. From fuel sippers to turbocharged performers, the automaker is boasting 19 new or revamped engines and transmissions, mostly available for the 2007 ...