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Jaguar XFR-S pitted against Mercedes E63 AMG

It was Steve Sutcliffe at Autocar who got the tough job of comparing the Mercedes-Benz E63 AMG to the limited edition Jaguar XFR-S on the track and sheep-strewn British B-roads. In UK spec both Mephistophelean sedans wrangle the same 542 horsepower, but step out of the corral and things look to weigh heavily in the Mercedes' favor: it has more torque, it's lighter, it's quicker from 0-to-60 and it's less expensive.
But that's on paper. Sutcliffe was given the job to see what effect all those letters and numbers had on the real-world driving experience. One of them is "an absolute hoot at the track" with great steering and weight management, one is "magnificent." To find out which is which, watch the video below.

Top torque-to-weight ratios under $100k, $50k and $25k

Horsepower may steal a lot of headlines, but the always-more-complex torque figure is often a critical one for both the workingman and the motoring playboy. The measure of rotational force represents the twist that can liquefy one's tires or haul one's horse trailer. Good stuff.
It follows then, that as with the horsepower-to-weight list that we assembled for you a few months ago, a list of cars that offer the most pound-feet with the fewest pounds to carry, is an interesting one to break down. Sure, there's a big difference in how the torque is applied from a turbocharged six-cylinder in a Swedish luxury sedan and a massive heavy-duty truck's turbo-diesel. But being the car/stat geeks that we are, we think it's kinda neat that those two vehicles rank near each other where torque and weight intersect.
As with the horsepower list, we've given you figures as pounds per every one pound-foot. Again broken down into broad price categories, we've got a mixed bag of 2014 and 2015 models here, too. Every effort has been made to select the most up-to-date prices and specs, and we've also to omitted some '14 cars that won't be re-upped after the ongoing yearly changeover.

Jaguar XFR-S is motor-porn on a mountain road

The 2014 Jaguar XFR-S might have only been good enough to take the runner-up spot in our Editor's Choice top five debuts at the LA Auto Show, but we'd be hard-pressed to find a car with a more exhilarating exhaust note. As proof of this, Jaguar released a video showing the XFR-S tearing up a windy, European mountain road in close to a minute of hardcore driving footage.
The big blue cat has the same great exhaust note of the XKR-S, and the driver puts all of the car's 550 horsepower to work demonstrating the handling - and drifting - abilities of the new XFR-S. If there's any disappointment to be had, it's the fact that you have to jump to the 30-second mark of the video for any of the action to start.
Scroll down to watch the video, and be sure your speakers are turned all the way up.