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2021 BMW M3 and M4 vs all the high-powered sport sedans and coupes

Should you have a found a way to get past that schnoz, you've probably digested some of the basic specs for the all-new 2021 BMW M3 sedan and M4 coupe specs. They're plenty impressive. There's also, basically, two sets of them thanks to the regular and Competition versions that differ in engine output and transmission type.  But how do they compare to other ultra sport sedans and coupes? Well, we were wondering that too, so we fired up the Autoblog Comparison Spreadsheet Generator 5000 (aka me chained to my computer in a dark basement).  Sadly, there are surprisingly few competitors for the 2021 BMW M3. Rival sedans include the Mercedes-AMG C 63 and the Alfa Romeo Giulia Quadrifoglio, along with the Audi RS 5 Sportback sedan/coupe/hatchback thing. There's no more Lexus IS F, the Cadillac CT4 Blackwing has yet to arrive and Jaguar doesn't offer a spicy XE R.  Happily, there are more coupe rivals for the 2021 BMW M4, including the two-door versions of the AMG and Audi as well as the Lexus RC F. I also included the Ford Shelby GT350 and Chevrolet Camaro SS 1LE. On paper, they align incredibly well. On the street and on a track, I can personally attest that these Americans are fully capable of keeping up and/or bettering the fancy-pants luxury brands (and let's not forget there are even more powerful, hardcore versions available). If they don't align in terms of price or prestige, whatever. OK, let's get to the spreadsheet. Let's start with the coupes and note that I didn't bother listing the dimensions for the M4 Competition and C 63 S as they are identical to their "lesser" siblings.  I won't bother burning words explaining what you can see on the chart. Instead, I'll point out a few things that stood out to me. First, BMW M comes awfully close to matching the output of AMG's twin-turbo V8 despite having two fewer cylinders. Similarly, Audi manages to better the 0-60 time of the M4 Competition and tie the C 63 S despite being WAY down on power. It's not like it weighs less. Magic? Second, and speaking of 0-60 times, remember the importance that transmission and drivetrain make with them. It's not just horsepower and torque. An automatic will be quicker and easier to launch than a manual, while all-wheel drive provides more instantaneous and beneficial grip.

New Corvette Feature Keeps An Eye On Valets

Face it. If you own a luxury or sports car, whenever you hand the keys to a valet, you imagine the car going on a high-speed joyride like the Ferrari in the 1980s cult movie "Ferris Bueller's Day Off." Now, General Motors has an option on the 2015 Chevrolet Corvette that takes those worries away. The latest version of the sports car, due out in September, has a feature that records where the car goes with a camera mounted in the windshield trim. It also captures audio in the cabin as well as speed, engine revolutions per minute, gear position and G-force. That all helps the car tattle on any valet who doesn't take a slow, direct route to a parking space. GM says it's the most extensive attempt by an automaker to thwart valet joyriders, although it's not the first. The automotive website Edmunds.com says Hyundai and Mercedes offer "geofencing," a feature that sets a perimeter and then notifies the owner's smart phone if a car goes beyond it. Chrysler has a valet mode that caps engine speed and horsepower, while Audi lets owners limit engine speed for valets. With the Corvette, once the owner activates the feature with a four-digit code, the touch screen tells the driver it's in Valet Mode. But it doesn't warn the valet that he's being recorded. The feature also locks the glove box and a storage compartment in the dashboard and shuts down the infotainment system. Valet Mode started off as a performance data recorder for those who take their Corvettes on the racetrack. GM engineers quickly figured out that it had more uses. "Think of it as a baby monitor for your car," Corvette Product Manager Harlan Charles said in a statement. "Anyone who has felt apprehension about handing over their keys will appreciate the peace of mind of knowing exactly what happened while their baby was out of sight." Data and video from the valet mode can be viewed instantly by the owner on the car's 8-inch color screen when the car is parked, or it can be downloaded to a computer. The system could go into more mainstream models if feedback is good on the Corvette, GM spokesman Monte Doran said. The feature is paired with a navigation system and costs $1,795. A 2015 Corvette starts at just under $54,000. Chevrolet Technology Gadgets

Six-week production shutdown planned for 2016 Chevy Volt

It's no surprise that GM is winding down production of the first-gen Chevy Volt as it prepares to start building the second-gen for a launch in the second half of this year, but for now, things are proceeding as planned, according to Chevrolet spokesperson Michelle Malcho. Malcho told AutoblogGreen that GM "is still making first generation Volt" and that there has been no announcement about when that will change. The only details she would divulge is that, "It will be this summer." "Halting Chevrolet Volt production in anticipation of the all-new 2016 model year is a smart move for GM," Akshay Anand, an analyst at Kelley Blue Book's KBB.com, said in a statement. "[The move] allows for less inventory and incentives on the outgoing model. Hybrid and alternative fuel vehicle sales have been declining for some time now, with gas prices well below the summer prices of 2014." Volt production will cease in the weeks before the traditional two-week auto plant shutdown over the July 4 holiday. A high inventory of Volts is a factor in the production cuts, but not the only one, Malcho said. The plant construction, engineering changes and pre-production plans for the new Volt and CT6 all were part of the decision, she said. Nationwide, there is about a 200-day supply of Volts on dealer lots (roughly 100 days in California, the car's biggest market), according to the Detroit Free Press, which says there will be a six-week retooling period (twice as long as normal, but other sources say the shutdown will be four weeks long) at GM's Hamtramck plant this summer to get ready for the second-gen model. The 2016 Volt will get an increase in all-electric range to 50 miles and will then get 41 miles per gallon when the battery runs out. It also has a fifth seat that straddles the battery tunnel and a larger li-ion battery. Related Video: The AP contributed to this report. Featured Gallery 2016 Chevy Volt View 16 Photos News Source: GM, Detroit Free Press Green Plants/Manufacturing Chevrolet Electric Hybrid