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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.

2025 GMC Sierra EV rumored to offer a smaller 170-kWh pack as standard

It's kind of wild that you can order a 2024 GMC Sierra EV Denali Edition 1 pickup, yet GMC hasn't released specific figures for battery capacity; maybe that's info you only get after putting down a deposit. Adding to the mystery, the 2025 GMC Sierra EV, already being promoted at the GMC site and which will be available later this year, will add a second battery. GM Authority says the pack in the 2024 truck (that only comes in one trim) is the 204-kWh pack we already know from the GMC Hummer EV. In April, GMC raised the estimated range rating for that pack from 400 miles to 440 miles, upped towing capacity by 500 pounds to 10,000 pounds, and raised max payload capacity by 150 pounds to 1,450 pounds. For 2025, GMA says the the Sierra EV range will add a smaller 170-kWh pack for lower trims.  Trims, you ask? Yes, next year's standard Denali trim will be joined by AT4 and Elevation trims. The AT4 will come with trail-use perks like four-wheel steering, CrabWalk, and two additional inches of ground clearance thanks to 18-inch wheels wrapped in 35-inch all-terrain tires, plus Super Cruise and a spray-on bedliner. Optional features on the AT4 include a DC fast charge upgrade to 350-kW, GMC's MultiPro MidGate, and the 10.2-kW Power Station Pro. The Elevation, typically a lower trim in GMC's vehicle lineups, comes with a power-operated frunk, the MultiPro tailgate, and sits on 18-inch wheels in 33-inch rubber. The Elevation options menu will offer the MultiPro MidGate, Super Cruise, spray-on bedliner, Power Station Pro, and fast charge upgrade. The Denali will come with all of these tech features standard, but sit on 24-inch wheels in 35-inch rubber. New colors will expand the palette from the sole option today, Thunderstorm Gray, to include Deep Ember Tintcoat, Deep Ocean Metallic, Moonlight Matte, Onyx Black, and Summit White. Back to the battery, the 2025 Sierra EV's order guide shows two pack options, an Extended Range and a Max Range, without giving capacity figures. GMA believes this will be a 20-module pack of 170 kWh, powering a range of around 380 to 390 miles. The 2025 trucks reportedly begin heading down lines in early September, starting with the Denali trim, so information should be forthcoming in the not-too-distant. The AT4 and Elevation trims will reach dealerships early next year.

J.D. Power: Mini, Lexus again offer most satisfying sales experience

JD Power has released its annual Sales Satisfaction Index Study, and once again Mini and Lexus have taken top honors. Overall, buyers are more satisfied with the auto-buying sales experience than they were last year, with those surveyed reporting an average score of 664 points on a 1,000-point scale. That's up from 648 in 2011. Dealer satisfaction also increased by five points over last year as well.
All told, Lexus brought home an index score of 737, which was high enough to put it atop the luxury brands for the second year in a row. JD Power says Infiniti came in second in that category with a score of 728 and Cadillac rounded out the podium with it's rating of 725. Speaking of Infiniti, that brand saw the single largest jump in sales satisfaction of any brand on the survey, popping up 52 index points over 2011.
Among mass-market brands, Mini ranked highest with a score of 712, followed closely by Buick with 706 and GMC farther down the line with 683. You can check out the full press release below for more information.