Chevrolet’s truck-based full-sized Tahoe SUV gets GM’s inline-6 Duramax turbo diesel engine. The result? Loads of torque off the line, a refined engine note and the fuel economy of some unibody crossovers. With the ability to tow up to 8,200 pounds, it might convince a lot buyers to go diesel. And the High Country is Chevy’s best Tahoe interior yet. Not everything is perfect though. Tom Voelk checks out a top trim 4WD High Country.