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Audi is working on a suspension that gets power from bumpy roads

Regenerative brakes aren't new. They're on virtually every hybrid and EV, and they're even starting to pop up on traditional gas-powered cars, like with the i-ELOOP-equipped Mazda6. But even with these systems, cars can get more efficient, and Audi thinks it found yet another source of wasted energy. The source? The suspension. The idea is to turn the kinetic energy that goes into the dampers into usable energy instead of as waste heat. Audi isn't the first auto company to come up with regenerative suspension – nearly three years ago, ZF introduced its GenShock technology, which used a valve attached to traditional, oil-filled hydraulic shocks to recapture kinetic energy from movement caused by bumps in the road. Audi's prototype technology, which it calls eROT, replaces traditional dampers with horizontally oriented electromechanical rotary dampers. eROT is apparently short for electromechanical rotary damper. Neat. In testing, eROT recovered an average of 100 to 150 watts on a typical German road, three watts from a fresh piece of pavement, and 613 watts on a rough stretch of tarmac (wattage is calculated as power over time, so this is actually the rate at which the system harvests energy). The dampers channel that energy to a tiny, 0.5-kWh, 48-volt battery. The prototype is claimed to cut CO2 emissions by three grams per kilometer (4.8 grams per mile), while the company believes a future production version could save up to 0.7 liters of fuel per 100 kilometers of driving. Converting the savings to American miles per gallon isn't easy, so we'll use a practical example. In the US, the Q7's supercharged 3.0-liter V6 returns a combined rating of 21 miles per gallon, which works out to 11.2 liters per 100 kilometers. Apply eROT's 0.7L/100km savings, and the Q7's economy would improve to 10.5L/100km, or 22.4 mpg, a 1.4-mpg improvement. That's not huge, but because math, 0.7L/100km is more dramatic on a more fuel efficient vehicle – taking an A3's 27-mpg combined rating and adding eROT would drive efficiency up 2.4 mpg, for example. There are a few other big benefits beyond fuel and emissions savings – Audi claims eROT provides a more comfortable ride than traditional active suspensions, because engineers can tune the compression and rebound strokes independently of each other. Beyond that, the horizontally oriented rear suspension geometry means more cargo space, since the dampers don't poke up into the cabin like they normally do.

Looking for meaning in Audi killing off its $1m electric supercar

Audi's most ambitious - well, most expensive, anyway – electric vehicle is no more. After building fewer than 100 of them (perhaps a lot fewer), Audi has cancelled the R8 E-Tron. Maybe it was the million-dollar-plus price tag. Maybe it was the " supreme hand-built quality." Maybe it was the fact that a non-electric R8 could be had for $164,150. Whatever the reason, was killing the R8 E-Tron a good idea? The R8 E-Tron would have been a good halo vehicle for the brand Here's the case for this being a shortsighted move. As we all know, the VW Group – and Audi especially – is in the middle of an electrification kick, and the R8 E-Tron would have been a good halo vehicle for the brand. Instead, it can stand as a prime example of waffling on the promise of plug-in vehicles. After all, Audi used to be incredibly proud of the R8 E-Tron, even if it had a tough history. The whole program was an on-again/ off-again kind of thing, but with enough momentum to get the EV some time at the Nurburgring. With both Mercedes and the EQ brand and BMW with its i brand moving strong into EVs, letting the headline be "Audi killed an EV" is not exactly fitting. It's not like Audi was wasting time making a lot of these. The R8 E-Tron went on sale in 2015 to customers who made a special request for it, and apparently only 100 did. But let's stop there. Getting 100 people to plunk down a million dollars or so for a car totals up to be a lot of money. There's no reason for Audi to price the car this high (forerunner vehicle programs almost always lose money for a time, just ask Toyota RE the Prius), but it did. And $100 million (if almost 100 were indeed sold) is nothing to scoff at, is it? It obviously wasn't enough to keep the lines and tooling open for this limited vehicle, and that sort of opens up a bigger question. Does the end (the second end, really) of the R8 E-Tron say something more important about EVs? Are they becoming less exotic high-end fixtures and more everyday transport? In a world full of Bolts and Ioniqs and E-Golfs – so, the world of 2017 and beyond – does a super high-end EV have any meaning? Gas-powered cars have managed to pull this off for decades, with Lamborghinis and Maseratis surviving just fine even with millions of Corollas out there. In a more-developed EV ecosystem, expensive EVs like the R8 should be able to do the same. Just not right now.

Porsche offering 250-hp 718 Cayman, Boxster in China

Porsche is studying a new approach in the lucrative Chinese market – less power. Automotive News Europe reports that the famed German manufacturer will sell less powerful versions of the 718 Cayman and Boxster in the People's Republic. In fact, the new cars are already on Porsche's Chinese consumer page. The hope, 718 chief Jan Roth told Automotive News Europe, is to replicate the success Porsche's sister company Audi has had with the TT. "A lot of the TTs that Audi sells in China, the smaller displacement 1.8-liter versions with rear-wheel instead of all-wheel-drive, are priced below that, Mercedes too," Roth said. We're guessing the comments about rear-wheel drive and a 1.8-liter engine are either typos or something was lost in translation, because Audi's Chinese website only lists a 2.0-liter engine, and most gearheads know the TT rides on a front-drive platform. Audi's success is largely down to price – 542,800 yuan ($81,549, at today's rates) for a base TT. Roth called 600,000 yuan "a magical threshold for customers in China." To hit that price point, Porsche is dropping the 718's 2.0-liter, turbocharged four-cylinder – offered North America and Europe with 300 horsepower in base form – to 250 ponies. The Cayman starts at 588,000 yuan ($88,340) while the Boxster is 598,000 yuan ($89,842). The 350-hp Cayman S will carry on unchanged. According to ANE, Roth said Porsche's Chinese strategy could drive 718 sales up to 4,500 units a year by 2017, nearly double the 2,500 Boxsters and Caymans sold in 2015. Could a similar lower-tiered strategy work in the US? We'll need to put on our speculation hats. In the US, the base car is about 81 percent of the price of the 350-horsepower S model. If Porsche were to offer the same discount for the hypothetical, 250-hp 718s, it could set the starting prices at $43,659 for the Cayman and $45,360 for the Boxster. That lines up neatly with the $43,500 TT Coupe, but this theoretical 250-hp Boxster would fall about $1,640 less than Audi's soft top. We shouldn't forget Porsche's expansive options catalog – we doubt there'd be a lot of sub-$50,000 718s on dealer lots. But still, slashing over $10,000 off the price of a $54,000 car is a big ask – Porsche would almost have to de-content such a lower-tier model. But – and this is a Kim K-sized but – moving the 718 downmarket would open the brand to a new range of consumers. Not only would these new cars be the cheapest sportscars from Porsche money could buy.