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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

2019 Toyota Avalon vs. full-size sedans: How they compare on paper

Full-size sedans aren't exactly in great demand at the moment, and at least one of the vehicles in this comparison has been rumored to be on the endangered species list. Yet, we've just had our first drive in the 2019 Toyota Avalon, and if anything has a chance of rejuvenating the segment a bit, it's an all-new version of what has long been the segment's benchmark. To see how the new Avalon compares, we've put together the below spreadsheet featuring the Avalon's primary apples-to-apples rivals, the Buick LaCrosse and Chevy Impala. We also included the Nissan Maxima, which is comparable in price, sales and non-luxury badge, and which offers the sort of increased driver engagement promised by the new Avalon XSE and Touring trim levels. We also included the outgoing Avalon for reference as well as that car's luxury cousin, the Lexus ES, which can definitely be cross-shopped with the luxuriously trimmed Avalon Limited. You can use our Compare Cars tool to create your own comparison, such as one featuring the rear-wheel-drive Chrysler 300, Dodge Charger or even Kia Stinger. Alright, enough chit chat. On to the spreadsheet. Performance and fuel economy The GM sedans may come standard with four cylinders, including a mild hybrid system in the LaCrosse, but puh-lease. The V6 is the name of the game in this segment, with outputs now surpassing the 300-horsepower mark. The LaCrosse is the horsepower and torque champ, though it also weighs a bit more than the new 2019 Avalon, so acceleration is likely to be comparable. The Impala weighs a lot more and has only a six-speed automatic, so despite having a wee bit more power, one should expect it to be pokier (not a good sign for a car rumored to be on the chopping block). One would expect the Maxima's 300 hp and lowest curb weight to result in the quickest acceleration, but then it's also strapped to a CVT, which despite being better than ever, is still a CVT. Things get worse for Chevy when you consider the Impala's base four-cylinder gets the same 25 mpg combined as the Avalon's V6 — once again a segment best. Now, should you really prioritize fuel economy, the 2019 Toyota Avalon Hybrid really stands out with a 43 mpg rating (or 44 with the base XLE trim) that bests the outgoing Avalon Hybrid. Honestly, after driving this new Hybrid, it actually seems like it would be the best bet for most buyers. There's sufficient power, and it only costs $1,000 more than the comparable V6 version.

The cars and trucks of 'Transformers: Rise of the Beasts'

The latest spectacle in the Transformers franchise is about to hit the theaters. The final trailer was released, giving us peeks at what appears to be a pretty boilerplate story about the end of the world. There's some kind of ancient interplanetary war brewing and it's up to some teenagers to sort it out with the help of their robot buddies. But this is Autoblog, so we're not even going to try to suss out a plot so thin it won't hold a spittle globule's worth of water. We'll just go over the cars. Transformers: Rise of the Beasts | Official Final Trailer (2023 Movie) Porsche 911 Carrera RS 3.8: Mirage So far the star of the film, car-wise, looks to be a blue-on-silver 964 Porsche named Mirage that is voiced by Pete Davidson. It's been the most promoted of the movie cars, even more so than formerly central characters like Bumblebee and Optimus Prime. Except, this isn't just any ordinary 911; it's a Carrera RS 3.8, a European-exclusive model of which Porsche only built 55 units. As the name implies, it came with a bored-out M64 turbo flat-six as opposed to the 964 Turbo's 3.6. It wore the Turbo's wide-body badonk with a bi-level rear wing, but Porsche reportedly stripped out 570 pounds' worth of weight despite embiggening key performance parts like brakes and wheels. Fortunately, no actual RS 3.8s were used in the movie. Producers instead built five cars for different purposes — shooting closeups of actors, jumps, the obligatory driving backwards real fast — out of lesser 911s. However, the sound department did record the engine note of an actual RS 3.8 for accuracy, as the higher crank speeds of the 3.8 have a distinctive sound.  In the original 1984 Transformers lineup Mirage was a Ligier JS11 Formula 1 car, complete with faux Gitanes cigarette branding (on a children's toy!). An F1 racer would raise an eyebrow on the streets, so it made sense to update to a street-legal sports car. If you're wondering why this Porsche isn't the character Jazz, whose original vehicle mode was an ultra-cool Martini-liveried Porsche 935, well, he was remade into a Pontiac Solstice voiced by Darius McCrary during the GM product placement rewrite in 2007's Transformers reboot, then unceremoniously killed. 1977 Chevrolet Camaro: Bumblebee Formerly the franchise star, Bumblebee gets far less screen time in the trailers. He's still a Camaro, but because Transformers: Rise of the Beasts takes place in 1994 he's not a fith-gen.