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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.

Recharge Wrap-up: BYD unveils 60-ft electric bus, Honda sticking with hybrids in Europe

BYD has debuted a 60-foot electric bus at the American Public Transportation Association Expo in Houston, TX. The Lancaster bus, as it is called, has a 120-passenger capacity and can drive over 170 miles on a single charge. The articulated bus features low floors and no steps, thanks to in-wheel hub motors. BYD also displayed a 40-foot electric bus that drove the 1,500 miles to the show under its own power (recharging along the way, of course). Read more in the press release below. Honda says it will continue to sell hybrids in Europe, despite the fact that it has stopped selling the CR-Z and Insight due to slow sales. "Our focus at the moment is on our 1.6-liter diesel but we haven't forgotten about hybrid technology," says Honda Europe's Philip Ross. Honda will sell the next-generation Fit (badged as the Jazz) in Europe when it launches next summer, and will sell the next-gen hybrid version beginning in 2016. Honda sold 4,500 of the Jazz hybrid in Europe last year. Read more at Automotive News. XL Hybrids is selling its XL3 Hybrid Electric Drive System in California. The news comes after the California Air Resources Board issued an executive order allowing the aftermarket hybrid conversion for 2012-2014 Chevrolet Express and GMC Savana vans. The XL3 Hybrid regenerative braking conversion increases real-world mpg by about 25 percent. Read more in the press release below. NRG eVgo has finished installing 60 charging stations at the Sony Pictures Entertainment studio lot and offices in Culver City, California. The Level 2 chargers, which will be managed by NRG eVgo, allow employees to charge their EVs during the workday. An average of 90 EVs and PHEVs park at the studio headquarters every day, thanks in part to Sony Pictures' Alternative Vehicles Incentive program for its employees. Learn more in the press release below. Pennsylvania's Public Utility Commission will allow operators of EV charging stations to set prices based on kilowatt hour usage. This change ensures that drivers pay for the actual energy they use, rather than the time they spend charging, since different cars can charge at different speeds. Car Charging Group has already begun using the per-kWh fee structure at its charging stations throughout the state. Other states that allow kWh pricing are California, Colorado, Florida, Hawaii, Illinois, Maryland, Minnesota, New York, Oregon, Virginia and Washington. Read more in the press release below.

Nissan Leaf is now the best-selling plug-in vehicle of all time in US

Numbers don't lie. And in some instances, you can see their truth from miles away. As everyone expected, the Nissan Leaf is now officially the best-selling plug-in vehicle in the US. While the two vehicles aren't direct competitors (one's a pure EV and the other is a plug-in hybrid), they certainly dominate the plug-in vehicle sales charts. When we do a little math on those charts, we see that since the two vehicles went on sale at the end of 2010, the Volt has sold 75,231 units while the Leaf is now at 76,407, giving the Leaf a 1,176-vehicle lead. The Leaf trailed the Volt by just two units at the end of February. This is the first time the EV had held the overall lead since the end of February 2012, when it was ahead 10,847 to 9,623 and for a while there at the end of 2013, the Volt was up by around 12,000 units. Times have changed, though, and we don't expect the lead to switch back until the next-gen Volt goes on sale later this year, and even then nothing is certain. The Leaf sold 1,817 copies last month, a drop of 27.5 percent from last year. Year-to-date, the Leaf has sold 4,085 units, down 21.2 percent from the same time period in 2014. There were 639 Volts sold last month, a 56.8-percent sales decrease compared to March 2014. So far this year, Volt sales are down 48 percent. Green Chevrolet Nissan ev sales hybrid sales