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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.

Which would you rather have, Audi's RS5 or Mercedes' C63 AMG 507?

If you're in the market for a German sports coupe with a naturally aspirated V8, run, don't walk, to your nearest dealer because they are going to be gone very soon. European fuel economy and emissions rules have conspired to force automakers into seeking forced-induction mills. Motor Trend personality Jonny Lieberman is hosting the retirement party in the latest Head 2 Head video, where he takes on the 2014 Audi RS5 and 2014 Mercedes-Benz C63 AMG Edition 507 to decide which is the ultimate Teutonic V8.
To make the decision harder, Lieberman challenges the duo on the first soaking wet roads that Southern California has seen in ages. It forces the coupes to confront some of the actual weather that the rest of the country encounters regularly and serves to even the playing field somewhat between the charismatic rear-drive Mercedes-Benz and the all-wheel drive Audi.
It really is the end of an era for these coupes. The next Audi RS4 is rumored to switch to a twin-turbo V6, and while Mercedes won't officially admit it, the next C-Class AMG will likely switch to a 4.0-liter twin-turbo V8. And we already know the next BMW M3/M4 will rely on a 425-horsepower, 3.0-liter inline-six. Let's enjoy these eight-cylinder German giants while we can, and scroll down to watch the video.

Audi says 13% of A3 sales are E-Tron plug-in hybrids

Audi's most recent metric for plug-in sales of its A3 Sportback line brings up the classic "glass half full" or "glass half empty" conundrum. The German automaker says that almost 13 percent of its A3 sales during the past year have been of the E-Tron plug-in hybrid variety. That's a decent rate, and a notable one because Audi said late last year that it was hoping that as much as a quarter of its global sales will be plug-in vehicles by 2025. The 2017 model-year Audi A3 Sportback E-Tron has the same specs as the 2016 version, featuring a 1.4-liter engine paired with an electric motor that together deliver 204 horsepower and 258 lb-ft of torque. The 2016 version was rated by the Environmental Protection Agency (EPA) as having an 86 miles per gallon-equivalent rating, and was estimated to be able to go as far as 16 miles on electricity alone. Audi notes that the EPA hasn't yet rated the 2017 version, but we expect it to be the same. The plug-in hybrid can zip from 0 to 60 miles per hour in 7.6 seconds. As for that 13-percent figure, Audi didn't specify if that meant US or global sales. The company moved 19,622 A3s in the US through July. At 13 percent, Audi would've sold about 2,500 A3 plug-in hybrids. To put that in perspective, the Ford Fusion and C-Max Energi PHEVs have moved 8,576 and 8,155 units this year, respectively. Audi of America president Scott Keogh said on the eve of last year's Los Angeles Auto Show in November that he wanted 25 percent of Audi sales to be plug-ins by 2025. The following month, Audi said it was hitting that 25-percent threshold in Norway and the Netherlands, where citizens tend to be a bit more plug-in-centric than Americans. But it's a good start. Check out our First Drive impressions of the 2016 A3 E-Tron here. Related Video: Featured Gallery 2017 Audi A3 Sportback e-tron News Source: Audi Green Audi Hybrid PHEV e-tron audi e-tron sportback a3