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Nissan Leaf makes it 19 in a row for record sales; Chevy Volt drops 21 percent

The Nissan Leaf continues its streak of "best month ever" sales with 2,881 EVs sold in September. Compared to the 1,953 sold in September 2013, that represents an increase of 47.5 percent and, as Nissan itself must be tired of saying by now, it marks yet another best month ever, same as last month and now the 19th in a row. Okay, sure, we know, Nissan will tout this run for as long as it can, but we're certainly expecting it each month, so if it ever doesn't happen, it'll be interesting to see how Nissan talks about it. Year-to-date, Leaf sales are up 35.7 percent compared to 2013. In any case, Nissan's director of EV marketing, Toby Perry, sent AutoblogGreen a statement that said, "Nissan Leaf owners have turned into some of our best marketers, and they jump at any opportunity to share their enthusiasm with friends and family. Take National Drive Electric Week – a grassroots celebration of all things EV and the perfect platform for LEAF owners to showcase the benefits of going electric. After celebrating with EV owners in more than 130 cities across the country, we saw a significant increase in Leaf showroom visits with midweek traffic just as heavy as what we see on the weekends." Year-to-date, Leaf sales are up 35.7 percent compared to 2013. Over on the Chevy Volt front, things aren't quite as rosy. After coming off a good August (the best sales month of 2014 by almost 500 units), Volt sales were down to 1,394, a decrease of 21.1 percent compared to September 2013. So far this year, Volt sales are down 13.2 percent year-over-year. It's kind of a stretch, but perhaps people are already waiting for the next-gen Volt, which will be revealed at the Detroit Auto Show in January, to go on sale? Speaking of things we say every month, our in-depth round-up of US green car sales is in process and will be appearing soon. Until then, please discuss how these two long-standing plug-in champs are doing on the sales floor. Green Chevrolet Nissan Electric Hybrid PHEV ev sales hybrid sales

How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

2021 Chevy Silverado, GMC Sierra fuel economy to go down due to global chip shortage

Production of the 2021 Chevy Silverado and 2021 GMC Sierra is continuing, but the global semiconductor chip shortage is resulting in a mid-year change. Or rather, an omission.  Basically, the availability of cylinder deactivation for the 5.3-liter V8 will be significantly reduced, resulting in a reduction of 1 mpg combined for affected models. This applies whether that engine has the six- or eight-speed automatic, as well as to both the regular Active Fuel Management and the more advanced Dynamic Fuel Management cylinder deactivation systems. DFM does remain with the pairing of 5.3-liter V8 and 10-speed automatic that comes standard on the LT Trail Boss and High Country. "Due to the micro controller shortage, the components that control AFM/DFM in the engine control module (ECM) have been removed," GM spokesperson Michelle Malcho told Autoblog. She also indicated that the engines will still have the AFM/DFM hardware in place, but that GM will not allow activation of the systems in the future with an ECM change.  Malcho also confirmed to Autoblog that the Silverado and Sierra's other engines will continue to have AFM and DFM, including the 2.7-liter turbo inline-four, 4.3-liter V6 and 6.2-liter V8. In an earlier statement to Reuters, she declined to say the volume of vehicles affected. "By taking this measure, we are better able to meet the strong customer and dealer demand for our full-size trucks as the industry continues to rebound and strengthen," Malcho wrote Reuters in an email. The change runs through the 2021 model year, she said. Malcho told Reuters it would not have a major impact on the Detroit automaker's U.S. corporate average fuel economy (CAFE) numbers. "We routinely monitor our fleet for compliance in the U.S. and Canada, and we balance our portfolio in a way that enables us to manage unforeseeable circumstances like this without compromising our overall (greenhouse gas) and fuel economy compliance," she said. GM's fleetwide fuel economy in the 2018 model year was 22.5 miles per gallon and was projected to rise to 22.8 mpg for 2019, according to a report by the Environmental Protection Agency. To meet federal CAFE requirements, automakers like GM often use credits from either earlier years where they faced less stringent rules and performed better than the requirements or buy credits from other automakers. GM said last month the chip shortage could shave up to $2 billion from this year's earnings.