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This map reveals the cleanest vehicles based on location

Naysayers love to point out how dirty the electricity grid mix is when it comes to charging electric vehicles. Curmudgeons are eager to jump into any conversation about EVs to enlighten the lucky listeners about how plug-in cars contribute to pollution, sometimes even throwing in a dash of climate-change denial for good measure. (Thanks, buddy. Pray, tell me more about the plight of oppressed SUV owners.) Unless someone buys an EV just because they think they're cool (which, yeah, they often are), they probably have at least a passable understanding of their environmental pros and cons. As many EV owners are already aware, location has a lot to do with any particular plug-in car's carbon footprint. Still, there's always more to know, and knowledge is not a bad thing, especially if one uses it to do the right thing. That's why this handy-dandy map from Carnegie Mellon University is so interesting. CMU researchers have compiled information about the lifecycle greenhouse gas emissions of various EVs based on where they're charged, as compared to gasoline-powered vehicles. The researchers looked at the Nissan Leaf, Chevrolet Volt, and Prius Plug-In Hybrid versus the gasoline-dependent Toyota Prius hybrid and the stop-start-equipped Mazda3 with i-ELOOP and compared grams of CO2 emitted per mile. CMU takes into account the grid mix, ambient temperature, and driving patterns. CMU takes into account the grid mix based on county, as well as ambient temperature and driving patterns in terms of miles traveled on the highway or in the city. For instance, if you drive a Nissan Leaf in urban areas of California, Texas, or Florida, your carbon footprint is lower than it would be if you were driving a standard Toyota Prius. However, if you charge your Leaf in the Midwest or the South, for the most part, you've got a larger carbon footprint than the Prius. If you live in the rural Midwest, you'd probably even be better off driving a Mazda3. Throughout the country, the Chevrolet Volt has a larger carbon footprint than the Toyota Prius, but a smaller one than the Mazda3 in a lot of urban counties in the US. The Prius and Prius Plug-In are relatively equal across the US. Having trouble keeping it straight? That's not surprising. The comparisons between plug-in and gasoline vehicles are much more nuanced than the loudest voices usually let on.

2019 GMC Sierra revealed with CarbonPro bed and new diesel engine

It's only March, and it's already been one hell of a year for trucks. January's Detroit Auto Show saw the reveals of the 2019 Ram 1500, 2019 Ford Ranger and the 2019 Chevy Silverado. The Chicago Auto Show brought new versions of the Toyota Tacoma and Toyota Tundra TRD Pro. Today, we finally got our first look at the Silverado's twin, the 2019 GMC Sierra. The truck features new styling, a new diesel engine and — on the Sierra Denali — a carbon fiber bed. As with every new full-size truck, the Sierra is larger than the outgoing model in almost every dimension, though exact dimensions haven't been revealed. For reference, though, the Chevy Silverado's bed is 7-inches wider than before. The new Sierra grille is more upright than before and features new C-shaped lighting. The Denali gets LED headlights, tail lights and fog lights. Both SLT and Denali trims get unique 22-inch wheels. As we saw in spy photos, the Sierra's interior is mostly just a copy of the Silverado's with some chrome accents sprinkled throughout. If you like the current truck interiors, you'll be pleased with the new model. Those hoping for a wholesale change will be left wanting. The big improvements inside include a full-color heads-up display, trailer hitch assist apps and cameras, and the rear-camera mirror found in models like the Chevy Traverse and Cadillac CT6. Safety and convenience features include a surround-view camera, blind-spot monitoring, pedestrian detection and low-speed automatic braking. Like the Silverado, there's been a significant effort to cut weight in the new Sierra. The 2019 model loses as much as 360 pounds compared to the current truck. It uses aluminum for the doors, hood and tailgate. Steel is still used for the fenders, roof and standard cargo box. The Denali, however, gets the real surprise here. Available only on the top-tier trim, the bed box will be constructed of carbon fiber rather than steel, saving 62 pounds. Carbon fiber only replaces the steel inner panels and floor. GMC says the carbon fiber will also help scratch and corrosion resistance. SLT and Denali models also get a new MultiPro tailgate. This is unique to the Sierra and separate from the Silverado's power assist unit. A new feature that helps one get into and out of the bed using an assist handle. The tailgate step has a maximum weight capacity of 375 pounds. There multiple positions that allow customers to extend the bed, or drop the center vertically to gain easier access to the back.

Chevrolet Silverado reportedly getting the GMC Sierra's MultiPro tailgate

GMC reinvented the pickup tailgate when it added a six-way option named MultiPro to the current-generation Sierra it introduced in 2019. It kept this clever feature to itself as a way to differentiate the Sierra from the Chevrolet Silverado, but a recent report claims it will begin sharing it in the not-too-distant future. Enthusiast website GM Authority learned from anonymous sources familiar with Chevrolet's product plans that the Silverado will soon receive its own version of the MultiPro tailgate. It will be called either MultiFlex or Multi-Flex, a name Chevrolet has already trademarked, and it was initially scheduled to make its debut for the 2021 model year. Its arrival might be delayed until the 2022 model year due to the coronavirus pandemic, however. Chevrolet's Silverado and GMC's Sierra are nearly identical under the sheet metal, so adding the latter's six-way tailgate to the former will be a relatively straightforward and cost-effective process. Interestingly, GM Authority wrote engineers could add a seventh function to the tailgate, though it didn't reveal what they have in store. It's also not sure whether both trucks will get the new feature, or if it will exclusively be offered on the Chevrolet. 2022 will bring major updates to the Silverado and the Sierra, potentially including — as we've previously reported — an independent rear suspension. Interior upgrades will allegedly be part of the mid-cycle changes, too, but we still don't know if the Silverado will receive the tough carbon fiber cargo box available in the Sierra. In the meantime, motorists in the market for a Sierra will temporarily have fewer options to choose from. GMC has asked its dealers to stop taking orders for the regular- and double-cab variants of the truck, according to a separate report from GM Authority. Putting the slower-selling regular- and double-cab trucks on hiatus will allow dealers to build up their inventory of crew-cabs, which sell far better and are in relatively short supply. These restrictions will remain in effect until the 2021 model year, which starts on September 14 for double- and crew-cab models and on September 21 for regular-cab trucks. All three body styles will be available in 2021. Related Video: