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Chevy Volt outsells Nissan Leaf for first time since October 2013

It's been a rough summer so far for both the Chevy Volt and the Nissan Leaf, the first two plug-in vehicles from major automakers that ushered in the modern plug-in era. In June 2015, sales were down from their 2014 levels. The Leaf was down 11.6 percent and the Volt was down 31.1 percent. For July 2015, things didn't get much better. July 2015's Volt sales of 1,313 were down 35 percent from July 2014 and are down 34.8 percent for the year-to-date. Nissan, on the other hand moved only 1,174 Leafs last month, down 61.1 percent. So far this year, Leaf sales are down 30.2 percent. What's interesting with this steep decline in Leaf sales is that allowed the Volt to outsell the Leaf for the first time since October 2013. Back then, the Volt sold 2,022 compared to the Leaf's 2,002 units. So far, Nissan has sold 83,312 Leafs in the US since the EV went on sale in late 2010. Chevy has sold 80,292 Volts. Even though Tesla doesn't release monthly sales figures, there's a good chance that the pricey Model S was once again the best-selling EV in the US in July, as it was in the first three months of 2015. At that time, Tesla delivered an average of just under 2,000 Model S EVs a month. We might get some insight into more recent numbers during the quarterly investor call on Wednesday. As we've said before, the low sales for the aging plug-ins can be explained by the fact that both the Leaf and the Volt are due for upgrades. The second-gen Volt is coming in a few months. Nissan is being cagey about when the updated Leaf will arrive, but given these latest sales figures, we wouldn't be surprised if the undisclosed timetable gets move up somehow. Related Video: The video meant to be presented here is no longer available. Sorry for the inconvenience.

2016 Chevy Colorado Duramax gets 31 mpg highway

The 2016 Chevrolet Colorado Duramax and its similarly diesel-powered GMC Canyon sibling are the most fuel-efficient new trucks on the market in America. The Environmental Protection Agency estimates 31 miles per gallon highway, 22 mpg city, and 25 mpg combined for two-wheel-drive Colorado and Canyon diesels. That's just good enough to take the pickup fuel-economy title from the Ram 1500 EcoDiesel HFE, which carries EPA estimates of 29 mpg highway, 21 mpg city, and 24 mpg combined. Four-wheel-drive models offer slightly lower economy figures of 29/20/23, respectively. Drivers can cover quite some distance, too – the GM twins' 21-gallon tanks mean a maximum range of 651 miles. <p>Your browser does not support iframes.</p> Diesel's reputation may be somewhat tarnished in the US after Volkswagen's emissions scandal, but Chevy wants to assure potential customers that there are no tricks with the Colorado's figures. The pickup's engine features NOx-reducing tech like exhaust gas recirculation, and the EPA and California Air Resources Board recently chose the truck to take the additional step of real-world emissions tests. The 2.8-liter Duramax four-cylinder with 181 horsepower and 369 pound-feet of torque had no problems with the more stringent evaluation, and "the agency expressed no issues or concerns," according to the company's statement. The diesel Colorado goes on sale this fall, and the Duramax costs $3,730 over a similarly equipped V6 model. We've gone ahead and included dueling press releases from both Chevy and GMC below for your reading pleasure. Related Video: CHEVROLET COLORADO DIESEL: AMERICA'S MOST FUEL EFFICIENT PICKUP 2015-11-09 2016 Colorado two-wheel drive model offers EPA-estimated 31 mpg highway Up to 7,700 pounds of trailering when properly equipped DETROIT – Chevrolet today confirmed that the 2016 Colorado two-wheel drive with the Duramax turbo-diesel will be the most fuel efficient pickup in America, offering an Environmental Protection Agency-estimated 31 mpg highway fuel economy. The EPA-estimated highway fuel economy for 2016 Colorado four-wheel drive diesel is 29 mpg. The EPA has issued a Certificate of Conformity for the Chevrolet Colorado Duramax diesel. The agency expressed no issues or concerns following its recent extensive testing and evaluation of the emission control system on the Colorado Duramax diesel.

Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video: