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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 Denali Ultimate Interior Review: Better by a million miles

We were right. So were customers. Basically, everyone who took one look at the interior of the current GMC Sierra/Chevrolet Silverado generation and immediately went "not good enough." Possibly followed by "not even close" and/or laughing. The Silverado cabin was especially egregious in the top-of-the-line Sierra Denali, which slapped some token bits of "wood" to the doors and center console sides and called it a day. It didn't even get the Silverado High Country's bronzey trim surrounding the touchscreen. Absolutely nothing about it said, "I am competitive with just about any Ram 1500 or, to a lesser extent, a Ford F-150 King Ranch or Platinum." That changes with the 2022 GMC Sierra. Do I really need to explain why the "After" (up top) is so much better than the "Before" (above)? I do not. The better question is: is it better or at least as good as the Ram and F-150 now? Yes! And! GMC actually upped the game further for 2022 by adding a level beyond the Denali: the Denali Ultimate. While both Denalis share a common design with each other and the also-new Sierra AT4X, that design is different than what you'll find in other Sierras and every redone Silverado. Please correct me if I'm wrong, but this is the first time the Silverado and Sierra have had such substantially different interiors. True, they're still awfully similar, but by GMC/Chevy standards, it might as well be night and day.  You can see the difference below: Denali Ultimate left, Silverado High Country right. Is one design better than another? I don't think so, but they are indeed different, which is great. BUT! Remember, this is the new Denali Ultimate we're talking about here. That means it goes beyond the regular Denali.  First, this "Alpine Umber" color with "Forge perforated leather seat trim" is only available on the Denali Ultimate and the only color available for the Denali Ultimate. It has a bit of the King Ranchy/Long Horny feel to it without going so far into cowboy land. I dig it. The regular Denali offers Jet Black or "Atmosphere/Brownstone" (shades of brown).  This leather then features white piping and super-cool baseball-ish contrast stitching. I would like to reiterate at this point that the Sierra Denali's previous idea of a luxury aesthetic upgrade was strips of wood-looking plastic. What's the word I'm searching for? Ah yes. "Effort." But wait, there's more!

Hertz and GM team up to put 175,000 rental EVs on the road

Hertz and General Motors have announced a significant partnership that will send up to 175,000 electric vehicles into rental fleets across the country. The deal will unfold over the next five years and include vehicles from all GM brands.   The partnership will run through 2027. Hertz estimates that the electric fleet can save as many as 8 billion gasoline-powered miles, removing 1.8 million metric tons of carbon dioxide-equivalent emissions from the air. Hertz says it will invest in becoming the largest renter of EVs in North America and notes that it already has tens of thousands available at 500 locations in 38 states. By the end of 2024, it plans to electrify a quarter of its fleet. Electric rental cars are a great way for travelers wanting to avoid gas, and they make excellent urban commuter cars. Hertz will also likely save a few dollars by avoiding oil changes and other routine maintenance that gas engines need. However, a hidden societal benefit of this deal may come when Hertz’s EV rental customers begin shopping for new cars. Many people are skeptical of EVs for various reasons, including range, charging, ease of operation, and cost. Giving people a low-risk introduction to EVs and the ability to test-drive one without a pressuring salesperson could drive more people to electrics. At the same time, there's also the risk that renters wanting to take their Hertz-GM EV on a road trip into sparsely populated areas may return with charging and range-related horror stories. Hertz currently doesnÂ’t ask what youÂ’re planning to do with your rental, but it does offer a chat service for questions, and range information is presented clearly on each vehicle. Related video: 2023 Cadillac Lyriq walkaround