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2015 Mercedes-Benz ML400 Quick Spin

Mercedes-Benz has taken a risk in its quest to downsize its engine range. For 2015, the brand's popular M-Class five-passenger CUV did away with its trusty 4.4-liter, twin-turbocharged V8, and has replaced it with a 3.0-liter, twin-turbocharged V6. It's no surprise that power is down thanks to this move. Outputs of 402 horsepower and 443 pound-feet of torque are replaced by 329 hp and 354 lb-ft, but weight is down significantly as well. The new ML400 is nearly 300 pounds lighter than the 4,982-pound ML550. Will that tradeoff be enough to satisfy a buying public that's embraced falling fuel prices by buying bigger and thirstier vehicles? To find out if the blown V6 is a suitable replacement for the twin-turbo V8, we spent a week at the helm of the all-new ML400. Driving Notes This 3.0-liter, twin-turbocharged V6 is the same engine being offered in the C400 and E400 sedans. Typical of today's turbocharged engines, peak torque is spread lavishly across the rev range, from 1,600 to 4,000 rpm. That's not as generous a spread as the ML550, which offers all its torque between 1,600 and 4,750, but the power on offer is easy to access. Importantly, the new V6 never feels flat-footed or unable to answer our commands. In fact, the ML400 feels even quicker than its six-second sprint to 60 would indicate, although it's not so fast as to challenge the 5.3-second time of the ML550. After a slight and expected bout of turbo lag, the power arrives suddenly and proceeds linearly until just south of the engine's 6,500-rpm redline. The throttle response is soft in Eco mode, as expected, but sharpens up slightly when the fuel-sipping mode is off, where the gas pedal is still easy to modulate. It's a quiet engine, too. Compared to the brawnier exhaust note of the old ML550 or the howling six-cylinder in the BMW X5 xDrive35i, the ML400's note is smooth and refined, befitting of a V6. Its turbocharged nature is instantly noticed, though. Get on the throttle and the 3.0-liter happily hisses its way up the tachometer. But, it's only when you get on the throttle hard that the engine really weighs in. In day-to-day driving and traffic its soundtrack is unobtrusive and relaxed. The EPA rates the ML400's fuel economy at 18-miles-per-gallon city and a 22-mpg on the highway. That's better than the 14 city and 19 highway of the old V8 ML, but it still seems a bit low, especially for the highway figure.

Xcar spools up the Mercedes-AMG GT

Xcar has sampled its fair share of high-performance machinery. And a fair few of them have come from Stuttgart and its satellite in Affalterbach. The British video crew had yet to sample the new Mercedes flagship, but it takes care of that in this latest installment. That's right, it's time to check out the new Mercedes-AMG GT. AMG's new twin-turbocharged halo car has a tough act to follow, hitting the scene in the wake of the celebrated Mercedes SLS AMG, what with its gullwing doors and big atmospheric V8. But even with those big, wide rubber shoes to fill, Xcar finds there's plenty to love in the new AMG GT – particularly in the exhaust note, which is far from a given from a forced-induction engine. And with as much as 503 horsepower on tap, Xcar aptly points out that it's as potent as many a supercar from just a few years ago. Yet it's far more reasonably priced – in relative terms, that is. It's enough to not only put BMW's M and Audi's Quattro divisions to shame, but put Porsche on notice in the process. And therein lies the vital question: is it better than a 911? Even a 911 Turbo? That's the answer that Xcar seeks to find in this latest video, but you'll want to watch it for yourself to see what conclusion they've reached. Related Video:

Mercedes-AMG developing halo car with new 12-cylinder engine

The SLS AMG was once the jewel of the Mercedes-Benz performance lineup, a commanding supercar the presence of which could be felt a football field away. The AMG GT has taken that crown with its seductive 4.0-liter V8 biturbo engine – a veritable bulldog cloaked in an alluring silhouette. But Mercedes was always clear: this was a Porsche 911-fighter. It was even called a "baby SLS." Now it appears in the world of three-starred performance halo-cars, Mercedes may be playing its own Game of Thrones. To be clear, the GT will remain top dog for some time to come, and that lineup "will expand," we're told. A Black Series is still at least a year or more away, and we could see another model in the AMG GT family beyond that. But a recent conversation with a Mercedes-AMG product planner in Austria revealed that a new halo car is in the works, one that will slot above the GT. It will likely draw power from a new 12-cylinder that's now in development, one that will be mated to an electric motor and battery pack. This ultra-hybrid setup could boast the greatest performance of any Mercedes yet. Crucially, it will have better fuel economy, good enough to justify its existence in an increasingly stringent regulatory environment. As for the new 4.0-liter V-8 in the AMG GT, you can expect to see a lot more of it, starting with the E63 AMG, sometime after the next Mercedes-Benz E-Class launches next year. Related Video: