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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.

2022 GMC Sierra 1500 Denali gets Super Cruise and an upgraded interior

The 2022 GMC Sierra 1500 is getting Super Cruise! Exclamation point required, because this is exciting news. Cadillac has been the sole owner of Super Cruise at GM from the start, and though we knew it was coming to the Hummer EV, we didn't know a fast-selling full-size pickup would be getting the technology. GMC says it will launch Super Cruise on the 1500 Denali, which is the most expensive and luxurious trim of the Sierra. It’s scheduled to arrive for the 2022 model year, but GMC qualifies that by saying “late model year 2022.” That means itÂ’s probably coming right toward the end, with 2023 scheduled as the first full year of Super Cruise in the Sierra 1500. GM also claims that the version of Super Cruise coming to the Sierra is capable of towing. Yes, hands-free towing, folks. WeÂ’re a little antsy, too. The tech is the same as the newest generation of Super Cruise coming in the Cadillac CT5 and CT4. ItÂ’s an improved version with more capability than the first-gen system that won AutoblogÂ’s Technology of the Year award a couple of years ago. Questions still remain to be answered, though. GM hasnÂ’t said anything about what it will cost on the Sierra 1500. WeÂ’re also left in the dark when it comes to other Sierra 1500 trim levels; and what about the Silverado 1500? It makes sense that GM would give the Sierra Super Cruise first, but itÂ’s certainly compatible with the Chevy version of the truck now, too. As for other GMC products, GM is quiet on when theyÂ’ll be blessed with Super Cruise. The redesigned Yukon would be the most obvious candidate being the flagship product, but GM says the program timing worked out best to launch on the 2022 Sierra, not the Yukon. ItÂ’s likely that the SUV will be updated with the system in the near future. Besides Super Cruise, GMCÂ’s photo also reveals that the 2022 Sierra is getting a fully digital instrument cluster. ItÂ’s surely an optional item, but could very well be standard on Denali. GM has flipped the speedometer and tachometer to opposite sides, but their digital versions still have that straight-edged GMC look to them. You can see the Super Cruise graphic in the center, and all the gauges are dropped down to the bottom of the display. But wait, thereÂ’s more. The photo also shows the beginnings of a totally new interior design, different from both the current Sierra, standard Yukon and Yukon Denali interiors. ItÂ’s immediately and obviously different everywhere we look.

GM's fullsize SUVs boost highway mileage by nearly 10 percent

We met the redesigned 2015 versions of the Chevrolet Suburban and Tahoe, and the GMC Yukon and Yukon XL at the 2013 LA Auto Show. Improved gas mileage numbers have been announced to go along with the improved exteriors and interiors, with city mileage improving by seven percent and highway mileage going up by nearly ten percent; you'll now get 16 miles per gallon in the city and 23 on the highway.
The only applies to models with the 5.3-liter engine, though, not the premium Yukon Denali and Yukon XL Denali SUVs with the 6.2-liter motor. Still, the 5.3 gets you more power than previously, with 355 horsepower and 383 pound-feet of torque underfoot, on top of the improved fuel economy numbers. The 6.2-liter sticks with official mpg ratings of 15 highway, 21 city. There's a brief press release below with words straight from the horse's mouth.