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GM resumes production of its 3.0-liter turbodiesel straight-six

General Motors temporarily stopped taking orders for trucks and SUVs equipped with the 3.0-liter Duramax turbodiesel six-cylinder engine in August 2021 due to a supplier shortage. Reports claimed the pause would last through 2021, but the engine is already back in production. Enthusiast website GM Authority learned from sources inside General Motors that the straight-six is once again coming off the assembly line at the Flint Engine Plant in Flint, Michigan. There's no official word on precisely what the problem was linked to and whether it was related to the on-going chip shortage that's wreaking havoc across the automotive industry. All we know is that the pause lasted for about two weeks. Called LM2 internally, the six is available in Chevrolet's Tahoe, Suburban, and Silverado 1500 and in GMC's version of these trucks. It's also an option in the Cadillac Escalade. It develops 277 horsepower at 3,750 rpm and a V8-like 460 pound-feet of torque at 1,500 rpm in every application, and it allows these big behemoths to post surprising fuel economy numbers. Fitted to a rear-wheel-drive Tahoe, the Duramax returns 21 mpg in the city, 28 mpg on the highway, and 24 mpg in a combined cycle, figures that make it more efficient than a Blazer. Demand for the diesel-powered trucks is relatively high. While the shortage undoubtedly took a toll on sales, the Duramax represented 8% of Suburban sales and 6% of Tahoe sales in May 2021. There are no other diesel-burning full-size SUVs available new so they have the market to themselves. On the truck side, Ram still makes the EcoDiesel available on some 1500 trims but Ford abandoned the segment. Related Video: Featured Gallery 2021 Chevrolet Tahoe RST View 24 Photos Chevrolet GMC Truck SUV Diesel Vehicles

The biggest gas-guzzlers of 2024: 'The Meanest List' is the opposite of greenest cars

In some circles — especially some automotive circles — bigger is better. This explains the Hummer, for example. In its so-called “Meanest List” of a dozen models, the American Council for an Energy-Efficient Economy (ACEEE) makes no apologies for berating “the worst-performing mass market automobiles” sold in 2024 in the U.S. The most diminutive car on the list is a Chevy Corvette Z06. At the top of this particular heap is the Mercedes-Benz AMG G63, a gas-powered SUV that the environmental agency says was “the worst-performing vehicle of the more than 1,200 models assessed by Greener Cars and has an annual fuel cost over $4,000.” Not to mention its MSRP of around $184,000. Rank Make & Model Powertrain Green Score MSRP Estimated Annual Fuel Cost* 1 Mercedes-Benz AMG G63 Gas 20 $184,000 $4,242 2 Ram 1500 TRX 4x4 Gas 22 $98,335 $3,819 3 Ford F150 Raptor R Gas 24 $79,975 $3,777 4 Cadillac Escalade V Gas 26 $152,295 $3,388 5 Dodge Durango SRT Gas 26 $74,995 $3,332 6 Jeep Wrangler 4dr 4X4 Gas 27 $35,895 $3,260 7 Jeep Grand Wagoneer 4x4 Gas 28 $91,945 $3,058 8 Mercedes-Benz G550 Gas 28 $143,000 $3,186 9 GMC Hummer EV SUV EV 29 $98,845 $1,746 10 GMC Sierra Gas 29 $37,700 $3,069 11 Chevrolet Corvette Z06 Gas 30 $114,395 $3,169 12 Mercedes-Benz Maybach S680 Gas 30 $234,300 $3,031 *ACEEE analysis using EIA data of the annual cost of driving 15,000 miles In terms of numbers, the dirty dozen of the meanest includes seven SUVs and three trucks. Lonely at the middle of the list is the sole electric, the GMC Hummer EV, which weighs in at 9,000 pounds. The council notes that “though EVs have lower emissions than similarly sized gasoline models, the Hummer demonstrates that size and efficiency, not just fuel source, are important factors in a carÂ’s environmental impact.” ItÂ’s also worth reminding prospective buyers that the average fuel cost of a vehicle on the “Greenest List” eats up only a fifth of the fuel cost of a vehicle on the Meanest List, “showing that greener options can also be more affordable.” The ACEEE also put out a "Greener List" of efficient gasoline and hybrid cars that don't require plugging in.  By the Numbers Green Cadillac Chevrolet Dodge Ford GMC Hummer Jeep Maybach Mercedes-Benz RAM Emissions Fuel Efficiency Green Automakers Truck SUV Electric Hybrid

15 vehicles most likely to surpass 200,000 miles

Americans drive a lot. Collectively, we put, on average, more than 13,000 miles on our cars each year according to the U.S. Department of Transportation. Because of this, a vehicle's ability to travel long distances without major problems is a huge consideration when it comes time to purchase a new one. It's also worth remembering that keeping an older car on the road instead of trashing it and buying new can be considered an eco-friendly decision. After all, it takes a lot of resources to build a car. iSeeCars.com, a website that aggregates used car listings from all around the country, recently ran through the numbers on millions of vehicles that are currently on the road to determine which last the longest. Alternatively, you could choose to look at this list as vehicles likely to be driven by owners who travel long distances. Either way, we've laid out the top 15 vehicles most likely to hit or even surpass the 200,000-mile mark. It's important to note that while these are the vehicles that have stood the test of time up until today, we can't guarantee future results if you decide to opt for one of these from a current model year. That said, unless we specifically say so in the text below, we've used pictures of current models for illustrative purposes. Now, with all of that out of the way, scroll on down for the top 15 vehicles most likely to crest 200,000 miles. 15: Toyota Sienna 14: Honda Odyssey The 15th spot and 14th spot on the list of the top 15 vehicles most likely to surpass 200,000 miles are both minivans. Spoiler alert: They will be the only two minivans on the list. According to iSeeCars, 3.2% of both of these family haulers crest the 200,000-mile mark, making them the best bets for families looking to put a ton of miles on their machines. 13: Honda Ridgeline 12: GMC Yukon The next spot on the list is occupied by the Honda Ridgeline pickup truck with 3.7% lasting past 200,000 miles. Unlike any of the other midsize trucks it competes with, the Ridgeline is based on a unibody chassis. Opting for this more car-like structure — as opposed to a traditional body-on-frame layout — allows Honda's hauler to ride and drive more like a car. Up next is the GMC Yukon, also with 3.7% past the 200K mark, and the first, but very much not the last, big traditional SUV you'll see on the list. In fact, get ready to see a whole bunch of 'em, including several from GMC parent General Motors.