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2015 GMC Yukon and Yukon XL hit the floor at LA

The middle child of General Motors' trio of truck-based SUVs, the GMC Yukon and long-wheelbase Yukon XL, received their auto show debut at today's 2013 Los Angeles Auto Show. Showing off a bigger, bolder look, particularly on its Denali trim, the Yukon sports prominent chrome grille instantly identifies GMC's new top-end SUV.
The Yukon is will come to market with a pair of engines. The base 5.3-liter V8 pumps out 355 horsepower and 383 pound-feet of torque, while the higher-end models benefit from the same direct-injected, 6.2-liter V8 as the Escalade. That engine makes 420 horsepower and 450 pound-feet of torque, with fuel economy seeing a likely boost thanks to an active fuel management system. Like the Tahoe, Suburban and Escalade, the Yukon takes advantage of a six-speed, column-mounted automatic transmission.
The cabin has seen significant upgrades in terms of materials and technology, with an eight-inch touchscreen display and IntelliLink standard in both Yukon and Yukon Denali. Fold-flat second and third-row seats come standard, while a power option is available, as well. Other techy features include active noise cancellation and standard Bose stereos.

2022 GMC Hummer EV No. 001 at Barrett-Jackson brings $2.5 million

This year's Barrett-Jackson auction in Scottsdale, Ariz., played host to a bunch of the first examples of hot new cars: VIN No. 001 of the 2022 GMC Hummer EV, 2022 Cadillac CT5-V Blackwing and CT4-V Blackwing, 2021 Ford Bronco, 2021 Ford Mustang Mach 1 and 2021 Ram 1500 TRX. Every single one of them sold for more than six figures, with all the proceeds of nearly $5 million going to charities, but the big winner was absolutely the Hummer with a hammer price of $2.5 million. The Bronco did nicely, too, with a selling price of $1,075,000. You can see the list of the sale prices from highest to lowest of these first examples below. GMC Hummer EV: $2,500,000 Ford Bronco: $1,075,000 Ford Mustang Mach 1: $500,000 Ram 1500 TRX Launch Edition: $410,000 Cadillac CT5-V Blackwing: $265,000 Cadillac CT4-V Blackwing: $165,000 Despite the Hummer going for $2.5 million, it wasn't the most expensive car to cross the block. That honor goes to a 1966 Shelby Cobra 427 Super Snake that was once owned by Carroll Shelby himself. It sold for $5.5 million, the same price it sold for back in 2007. Nearly as pricey as the Hummer was a restored, numbers-matching 1967 Ferrari 275 GTB/4 that went for $2,475,000. Related video:

Diesel Power finds the ultimate modified oil-burner

For nine years, Diesel Power magazine has run the Diesel Power Challenge, this year's grindfest being "a week-long torture test that features seven events, nine trucks, 8,000 horsepower, and nearly 15,000 pound-feet of torque." The road to being crowned "the most powerful truck" starts with a dyno run, and then continues through the completion of a CDL-style obstacle course, an eighth-of-a-mile drag race while towing a 10,000-pound trailer, a quarter-mile drag race without a trailer, a fuel economy test in the mountains and finally a sled-pulling test through a 300-foot-long packed-mud pit.
What kind of trucks get into such a fight? Last year's winner, for instance - who upgraded his truck this year to prove he didn't "luck into the win" - drives a 2008 Ford F-250 Super Duty with a 6.4-liter Power Stroke V8 upgraded with a custom intake, Elite Diesel triple turbos and a two-stage nitrous system. Another competitor has a 2005 Dodge Ram 2500 powered by a 5.9-liter Cummins inline-six, upgraded with Garrett turbos, dual-stage nitrous, a seven-inch exhaust stack and twin fans built into the bed to cool the Sun Coast Omega transmission. The numbers on that truck: 1,255 horsepower, and 2,063 pound-feet of torque at the wheels. Naturally, as the image above might suggest, things don't always end well.
You'll find all five videos covering this years challenge below. A scene in the dyno video sums it all up perfectly: a competitor leaves his nitrous on too long and the crew is treated to some ominous poppings, he leans out the window, throws both hands up and shouts, "Amer'ca!"