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2014 GMC Sierra [w/video]

Big And Boxy Might Be Best
As immense fans of the Back to the Future trilogy, we sometimes like to envision an alternate timeline in which General Motors had killed off GMC and kept Pontiac instead. The G8 GXP would still be on the road handily beating German sport sedans costing twice as much, while the lowly G3 would morph into a true subcompact-killer based on what is now the Chevrolet Sonic RS. While we're at it, let's go ahead and imagine the G6 has become the best-selling car in the US and the Torrent crossover is selling 20,000+ units per month. Far-fetched, we know.
The thing is, these fanciful statements would have to be true to make the case against keeping GMC. Pontiac may have offered more excitement than GMC, but money talks, and a full line of trucks, crossovers and SUVs have made a lot more money for GM than the arrowhead brand ever did. How much? As we learned last month, about two-thirds of GM's global profits came from its fullsize trucks, and GMC's trucks typically have thicker margins than their Chevrolet counterparts.

2016 GMC Terrain Denali Quick Spin

Here's a bewildering statistic – General Motors sold over 347,000 GMC Terrain and Chevrolet Equinox crossovers in 2014, making the Theta platform twins the best selling vehicles in their segment. GM sold more Equinox/Terrain crossovers than Honda did CR-Vs, Ford did Escapes, and Toyota did RAV4s. After a week behind the wheel of the 2016 Terrain Denali, we can't fathom why GMC's entry, which accounts for nearly a full third of GM's annual small CUV sales, has been so popular. An inefficient engine, cheap interior plastics, uncomfortable seats, a shortage of technology, and a high price left us questioning why anyone would order this Denali over a Titanium-trim Ford Escape, a Jeep Cherokee Limited, or a Hyundai Santa Fe Sport with the Unlimited Package. Driving Notes While looks are subjective, we'd posit that GMC didn't go far enough with its 2016 mid-cycle refresh. New accents on the front bumper, a tweaked grille surround, and LED running lights round out the changes up front, while the rear gets a slightly different bumper. GMC claims there's a new hood, although we challenge you to pick out the differences – here are the official galleries for the 2013 and 2016, if you'd like to try. GMC missed a tremendous opportunity here. New headlights, some restyled taillights, and tweaked mirrors would have given the impression of a more significant refresh. As it stands, these changes don't add up to much. GMC also claims it made changes in the cabin, adding a "revised instrument panel center stack." Aside from the missing CD slot, which has been replaced with an oddly shaped and not terribly useful shelf, it's hard to spot much of a difference. The Terrain Denali's cabin materials feel cheap. You'll be spending at least $35,000 to park one of these in your driveway, but aside from the leather-and-faux-wood steering wheel, no material feels worthy of that price tag inside. The lower dash plastics are hard and scratchy, the center stack feels hollow and creaks when pressed on, and the too-small shade over the seven-inch display feels flimsy. The upper dash is covered in a cheap-feeling, leather-like material that looks unchanged from when the Terrain Denali debuted back in model year 2013. These materials don't make sense in a vehicle that, as tested, exceeded $41,000. The most egregious thing about the refreshed Terrain is the lack of content.

Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.