As for those first Duramax Turbo-Diesel builds ... Thankfully, when GM debuted the LLY Duramax in 2004, the engineering team ...

GM didn't change all that much for the LLY, with the main differences being new fuel injectors, an updated turbo, and a revised VIN, the latter being the quickest way to tell the two engines apart.

And while exact fuel economy numbers have yet to be released, Chevy says the turbo engine will be more efficient than the V6. On top of all that, the four-cylinder also boasts a peak torque ...