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January no slump for Chevy Volt this year

The mild winter didn't tank January sales for the Chevy Volt this year. While last month's sales were a lot lower than December's – because January new vehicle sales are almost always lower than December's - the second-gen Volt had a good month. GM sold 996 Chevy Volts last month, an increase of 83.8 percent over the 542 sold last January. In December, 2,114 Volts were sold. The trend wasn't as good over at Nissan, which sold 755 Leafs in January. That's a drop of 29.4 percent compared to the 1,070 sold in January 2015. Given the lower overall sales for the Leaf these days, the drop from December wasn't as bad, with 1,347 Leafs sold in the last month of 2015. What's absolutely amazing is that after over five complete years of sales, the cumulative totals of the Leaf and Volt sales in the US remain almost exactly the same. The current difference is only 600 units, with the Leaf on top. If the Volt continues to outsell the Leaf for the next few months – and all indications are that that is likely, since Nissan is offering the first-gen model while Chevy has put out it much-improved second-gen - then we will soon get back to an equilibrium like we were at the end of February 2015, when the difference was just two units. As always, our more complete wrap up of all the green car sales in the US will be coming soon. Stay tuned. Related Video: News Source: Nissan, GM Green Chevrolet Nissan Electric ev sales

Here are the best-selling cars and trucks from January 2015

Every month, Autoblog slogs through all the sales figures reported by automakers that do business in the United States, and, after a little bit of sorting, we put it into an easy-to-read chart in an attempt to make it as easy as possible to follow the ins and outs of sales and shipments. But that only covers the brands themselves, not the individual models they sell. And we think you'd all be interested in knowing which vehicles beat their rivals in sales from month to month, so we've put together this handy gallery to keep you in the know. While the leader of the pack may not come as much of a surprise, the order that the top ten finishes in changes frequently – due to automaker deals, the price of gas, etc. – and we've included some statistics to help you see how their current performance stacks up to month's past. Click here to see January 2015's Top Ten Best-Selling Cars And Trucks In America. By the Numbers Chevrolet Ford GM Honda Nissan RAM Toyota Car Buying

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.