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Supercharged 2015 Chevy Corvette Z06 takes the C7 beyond the ZR1

The Z06 is just about everything we got in the last ZR1, but better.
After a bright-yellow false start, here is the real thing: the fourth-generation, 2015 Corvette Z06. If Chevrolet makes a ZR1 version of the C7 Corvette, it's going to be absolutely mega, because the Z06 is just about everything we got in the last ZR1, but better.

Nissan Leaf sales drop, new Chevy Volt climbs in November

This is probably just how things are going to be from now on. With the second-gen Chevy Volt available in some states and Nissan dragging its heels on getting a true new version of the Leaf onto dealer lots, it's no surprise that plug-in vehicle shoppers are turning to the Volt in a big way. Yes, we know that a pure EV and a PHEV are not the same and that the Volt and the Leaf are quite different cars, but after all of this time tracking the two plug-in sales champions, we feel obliged to continue our monthly look at who's selling how many of what. Here goes. We'll start with the mediocre news. That'd be the Leaf sales, which came in at just 1,054 units last month. That's the lowest monthly sales total for all of 2015 and, in fact, the lowest month of Leaf sales since February 2013. It's also a 60.8 percent drop from November 2014's sales of 2,687. This despite the fact that you can now get a new Leaf with a longer range of 107 miles (vs. 84) for a higher cost. The new Volt (along with the first-gen Volts that are still being sold out there), on the other hand, was up 49 percent, to 1,980 sales. That gave the Volt its best November ever, "on both a total and retail basis," GM says. The Volt beat the Leaf in October, too, and we suspect this is going to be the story until Nissan figures out how to get people excited about a five-year-old model or introduces the second edition. As always, we'll have a fuller wrap-up of US green car sales in our By The Numbers report soon. Green Chevrolet Nissan Electric Hybrid ev sales

GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.