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Watch this 840-hp Jeep Grand Cherokee SRT8 walk away from GT-Rs and M3s

This last-generation Jeep Grand Cherokee SRT8 does things that SUVs just shouldn't be able to do, like win drag races against tuned Nissan GT-R and BMW M3 coupes. Granted, the owner isn't coming into this fight with a stock Jeep – far from it. In addition to twin turbos whistling away, he says the engine is a 449-cubic-inch V8, which is nearly 7.4 liters of displacement. As it runs here, the driver claims that the turbos are pumping out around 14 psi of boost to give an estimated 840 horsepower. What's more, he further maintains the powertrain could reach around 1,200 hp with things fully cranked up. Even somewhat dialed back, this Jeep is ready to take on a breadth of formidable challengers, including a couple of Chevrolet Corvette models and a Lamborghini Aventador. Check out the video to see how this menacing Grand Cherokee fares in a day at the races.

EPA suspected Fiat Chrysler of using 'defeat device' in 2015

U.S. regulators told Fiat Chrysler Automobiles in November 2015 that they suspected some of the automaker's vehicles were equipped with secret software allowing them to violate emission control standards, according to emails disclosed on Friday. The U.S. Environmental Protection Agency and California Air Resources Board accused Fiat Chrysler in January of using the software, known as a "defeat device," to illegally allow excess diesel emissions in 104,000 Jeep Grand Cherokees and Dodge Ram 1500 trucks built between 2014 and 2016. Byron Bunker, director of the EPA's Transportation and Air Quality compliance division, said in a January 2016 email to Fiat Chrysler, obtained by Reuters under the Freedom of Information Act, that he was "very concerned about the unacceptably slow pace" of the automaker's efforts to explain high nitrogen oxide emissions from some of its vehicles. Nitrogen oxide is linked to smog formation and respiratory problems. Bunker's email said the EPA had told Fiat Chrysler officials at a November 2015 meeting that at least one auxiliary emissions control device on the car maker's vehicles appeared to violate the agency's regulations. Mike Dahl, head of vehicle safety and regulatory compliance for Fiat Chrysler's U.S. unit, responded in a separate email that the company was working diligently and understood the EPA's concerns. He added that if the EPA identified Fiat Chrysler vehicles as containing defeat devices it would result in "potentially significant regulatory and commercial consequences." The documents redacted the vehicles named, but two officials briefed on the matter said they referred to diesel models. The EPA's November 2015 meeting with Fiat Chrysler came two months after Volkswagen AG, mired in a major tailpipe emissions scandal, admitted to installing secret defeat device software in hundreds of thousands of U.S. diesel cars to make them appear cleaner than they were on the road.

2018 Jeep Wrangler four-cylinder fuel economy revealed

Fuel economy numbers for the 2018 Jeep Wrangler with the turbocharged 2.0-liter four-cylinder have finally been announced by the EPA. In the city, the two-door model gets 23 mpg, and the four-door Unlimited gets 22. Highway fuel economy for the two-door is 25 mpg and 24 for the four-door. Combined for the two-door and four-door is 24 and 22 respectively. These aren't Prius numbers, but they do make the four-cylinder Wrangler the most efficient version of the off-roader so far. The rest of the Wrangler range with V6 power gets 20 mpg combined, with the exception of the manual four-door, which gets 19. The most efficient V6 models in the city are the automatic models, which, regardless of length, get 18 mpg. On the highway, the best V6 is the manual two-door, which manages 25 mpg, and only loses 1 mpg in the city to the automatic. The question is, is the improved fuel economy worth the price premium of the four-cylinder? The automatic-only four-cylinder engine is an extra $1,000 over a V6 automatic, and $3,000 over a V6 manual. And when looking at the annual fuel cost estimates at fueleconomy.gov, you might only save $50 to $100 each year. The problem being that, while it's more efficient, it also demands premium fuel that the V6 doesn't. So it could be quite a while before the upfront cost is recouped. But if you want a Wrangler that's a little nicer to the planet, it's probably the way to go, plus you get an extra 35 pound-feet of torque over the V6, even if it means sacrificing nearly 20 horsepower. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.