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GM's MPG overstatement could affect 2 million vehicles

Late last week, GM admitted that three of its large SUVs fuel economy window stickers did not match their actual efficiency ratings, and so the vehicles couldn't be sold. The stickers on the 2016 Chevy Traverse, GMC Acadia, and Buick Enclave said their ratings were one to two miles per gallon better than they should have been. Officially, the number of affected vehicles sits at about 60,000. But Consumer Reports makes a good point: what's up with all of the previous model year SUVs that are basically the same vehicle? To wit: the 2016 model year vehicles are not substantially different than the 2015 or the 2014, or even going all the way back to 2007. On the EPA's fuel economy website, all of these older models will "have better stated fuel economy numbers than the new vehicles in GM's dealerships," Consumer Reports noted. CR's best point, and the one that makes the 60,000 number potentially grow to 2 million if all of the vehicles built on this platform are affected, is that "[i]t seems unlikely that the company would change the powertrain on these carryover models so late in their model cycles in a way that would cause a dramatic, negative impact on fuel economy." GM says that earlier model year SUVs are not affected and the EPA did not respond to CR's question about the potential for more discrepancies. We've seen automakers reverse course before, so if GM has to come out with a mea culpa soon, don't be surprised. GM is rushing corrected stickers to dealers so that the SUVs can be sold again, but a fix for the already-sold vehicles could be trickier to solve. Related Video: Related Gallery 2013 GMC Acadia View 16 Photos News Source: Consumer Reports Government/Legal Green Buick Chevrolet GMC Fuel Efficiency mpg gmc acadia chevy traverse

2016 Chevrolet Camaro design teased

Chevrolet just can't seem to help itself from continuing to tease the next-gen Camaro. The pony car gets its official debut at a big event on Detroit's Belle Isle on May 16, but the upcoming model's new exhaust, suspension components, and wheels are already well known. With this latest taste, we're finally getting an official glimpse at what the coupe actually looks like. The 2016 Camaro's shape hasn't completely been a secret, and even Chevy showed it testing while covered in camouflage in March. Still, these shots are a great opportunity to check out some undisguised details for the new model. The styling is supposed to be "more athletic," according to Chevy, and the aluminum hood looks especially good with crisp, straight lines forming the design. "It's a more expressive evolution of the Camaro's iconic character – and one that complements its leaner size and sharper reflexes," GM global design boss Ed Welburn said in a statement. These two photos suggest a more angular, futuristic shape for the upcoming pony car. We're looking forward to seeing it all in a couple weeks. Sculpted Exterior Reflects 2016 Camaro's New Athleticism 2015-04-30 DETROIT – For the all-new 2016 Chevrolet Camaro, the design team set out to create a leaner, more athletic design that complemented the new driving experience. "The Camaro went to the gym and came out with a lithe, more athletic physique for the sixth generation," said Ed Welburn, vice president, GM Global Design. "It's a more expressive evolution of the Camaro's iconic character – and one that complements its leaner size and sharper reflexes." The exterior design vocabulary is defined by complex shapes, which appear to be form-fitted around the mechanical components. Every shape and surface detail is a skilled, artistic collaboration of hand and digital sculpting. Camaro's new design details draw the eye into the design. For example, the new aluminum hood features powerful, smoothly curved sculpted forms accented with sharp creases. As a result, the hood appears to be shrink-wrapped around the engine. Similarly, the new Camaro retains the broad, dramatic rear fenders that became a defining feature of the award-winning Gen 5 Camaro. The design is updated with greater detailing, including a subtle crease running parallel to the fender edge. The effect makes the new Camaro look even lower and wider despite having a slightly smaller footprint than its predecessor.

Is the skill of rev matching being lost to computers?

If the ability to drive a vehicle equipped with a manual gearbox is becoming a lost art, then the skill of being able to match revs on downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. The usefulness of rev matching in street driving is limited most of the time – aside from sounding cool and impressing your friends. But out on a race track or the occasional fast, windy road, its benefits are abundantly clear. While in motion, the engine speed and wheel speed of a vehicle with a manual transmission are kept in sync when the clutch is engaged (i.e. when the clutch pedal is not being pressed down). However, when changing gear, that mechanical link is severed briefly, and the synchronization between the motor and wheels is broken. When upshifting during acceleration, this isn't much of an issue, as there's typically not a huge disparity between engine speed and wheel speed as a car accelerates. Rev-matching downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. But when slowing down and downshifting – as you might do when approaching a corner at a high rate of speed – that gap of time caused by the disengagement of the clutch from the engine causes the revs to drop. Without bringing up the revs somehow to help the engine speed match the wheel speed in the gear you're about to use, you'll typically get a sudden jolt when re-engaging the clutch as physics brings everything back into sync. That jolt can be a big problem when you're moving along swiftly, causing instability or even a loss of traction, particularly in rear-wheel-drive cars. So the point of rev matching is to blip the throttle simultaneously as you downshift gears in order to bring the engine speed to a closer match with the wheel speed before you re-engage the clutch in that lower gear, in turn providing a much smoother downshift. When braking is thrown in, you get heel-toe downshifting, which involves some dexterity to use all three pedals at the same time with just two feet – clutch in, slow the car while revving, clutch out. However, even if you're aware of heel-toe technique and the basic elements of how to perform a rev match, perfecting it to the point of making it useful can be difficult.