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GM will compensate SUV owners for fuel-economy error [UPDATE]

General Motors will offer debit cards to owners of some of its crossover SUVs after it was discovered that GM overstated the vehicles' fuel economy on window stickers, Automotive News says. GM will offer reimbursements to about 135,000 customers that are worth between $450 and $1,500 each. Some owners will also have the option of being provided with an extended warranty free of charge instead of the debit card. GM overstated fuel economy on about 170,000 vehicles by one to two miles per gallon because of what it has said was an inadvertent error stemming from not factoring the impact of emissions-related hardware into the EPA window-sticker figures. As a result, GM put a temporary stop-sale on the Chevy Traverse, GMC Acadia, and Buick Enclave before switching out the window stickers on about 60,000 vehicles. Automotive News says letters and debit cards will be sent out next week, and Reuters is estimating that the reimbursement program will cost GM about $100 million. With automakers ranging from Hyundai/Kia to Ford to, more recently, Volkswagen and Mitsubishi being ensnared by emissions or fuel-economy-rating issues, GM is working quickly to address the problem. For those curious, the reimbursement totals, factoring in current gas prices, the SUVs' combined fuel economy, and typical driving of about 12,000 miles a year, will provide between three and 12 months worth of free gas for those drivers (the models get either 17 or 18 miles per gallon combined, depending on front- or four-wheel-drive configuration). While about 135,000 customers will be reimbursed, Automotive News says the fleet buyers of about 35,000 crossovers haven't been addressed yet. UPDATE: GM spokesman James Cain, in an e-mail to Autoblog on Sunday, confirmed that the company will reimburse about 135,000 customers. Purchase customers will be given the option of a pre-paid debit card or a 48-month/60,000-mile protection plan, while lease customers will be offered the pre-paid debit cards. Most of the cards will have a value of between $450 and $900 on them. "We want all of our customers to have a great ownership experience, so we designed this reimbursement program to provide full and fair compensation in a simple, flexible, and timely manner," he wrote.

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.

New Takata problem results in recall of 414 GM vehicles

An airbag-inflator rupture discovered by Takata during testing has resulted in a new recall affecting 414 vehicles from General Motors, including 395 of them in the US. This latest campaign covers 2015 model-year examples of the Buick LaCrosse, Cadillac XTS, Chevrolet Camaro, Equinox, Malibu, and GMC Terrain. There are no reported breaks in any of these vehicles on the road, and the company estimates only one percent of them actually have the faulty parts. According to documents submitted to the National Highway Traffic Safety Administration (as a PDF), one side-airbag inflator failed a cold test at -40 Fahrenheit "releasing high pressure gas and propelling the separated components apart." The supplier told GM about the failure the next day. In these vehicles, the safety device might not only burst but the bag could inflate incorrectly, as well. GM and Takata say that a cause is not yet known, but they are "conducting an investigation." GM will begin notifying affected owners via overnight mail on Oct. 19. Dealers will replace the side airbag modules on all of the affected vehicles with new components outside of the suspect lot. All of the removed parts will also be collected for further study. Takata's faulty front airbag inflators have resulted in a serious scandal for the supplier. Initial figures indicated 34 million US vehicles are need of repair, though more recent figures have knocked that down to 23.4 million bad parts in 19.2 million automobiles. GM was already among the dozen automakers with models to fix, and some of its pickups were affected, along with the Saab 9-2X and Pontiac Vibe. GM Statement: General Motors is recalling 395 cars and crossovers in the U.S. because one of the front seat side air bags inflators may be defective. In the event of a deployment, the air bag's inflator may rupture and the air bag may not properly inflate. The rupture could cause metal fragments to strike the vehicle occupants, potentially resulting in serious injury or death. GM is unaware of any incidents involving vehicles with these components, which were part of a lot in which one inflator failed acceptance testing at the supplier. Dealers will replace the side air bag module or modules in affected vehicles. Including Canada, Mexico and exports, the total population of the recall is 414, GM estimates 1 percent of the recalled vehicles may have the defect.