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Watch this 650-hp Hennessey Jeep Grand Cherokee go from 0-60 in 3.9 seconds

Hennessey Performance Engineering has created an HPE650 package for the Jeep Grand Cherokee SRT fitted with the 6.4-liter Hemi engine. When it leaves the showroom floor it has 470 horsepower and gets from 0-60 miles per hour in 4.8 seconds. When it leaves Hennessey's garage floor after the upgrade it has 650 horsepower - 530 hp at the wheels, according to Hennessey - and gets to 60 mph in 3.9 seconds on its way to running the quarter-mile in 12.6 seconds.
There's more than just a Roots-type supercharger bolt-on, with ported cylinder heads and high-flow headers among the many changes made to the engine. You can watch this pre-2014 facelift silver model prove its spec sheet on the drag strip in the video below.

Jeepster name may be used for Fiat-based baby Jeep

In 1948, Willys-Overland, the forbearers of Jeep, built a vehicle called the Jeepster. It was a funky little thing, designed as a mix of the more rugged Jeeps that came before with what was then a modern car, which arguably makes it the world's first crossover. The name was later revived from 1966 to 1972, which means for Jeep enthusiasts, it has some history.
Now, the modern Jeep brand may revive the Jeepster name for a new product, likely based on Fiat bones, that will slot in at the bottom of the brand's range underneath the soon-to-depart Compass and Patriot. The report comes from Australia's Drive, which cites a dealer source that has seen the vehicle.
That same dealer confirmed there is a link between the Jeepster and the rumored Fiat 500X, and that the former will be available in both front and all-wheel-drive variants. The source also claims both gas and diesel engines will be available, although as this is an Aussie site, we shouldn't take that to mean we'll get a diesel Jeepster in the US.

2015 Jeep Cherokee finds a bit more fuel mileage thanks to stop/start and aero tweaks

Just a year after it burst onto the scene, Jeep has already made a pretty substantial addition to its V6-powered Cherokee, which has proven to be an extremely popular seller so far for the brand, adding a new stop-start system for the midsize, off-road-ready CUV.
The addition of stop-start included a few aerodynamic tweaks to the Cherokee's polarizing body, resulting in a wallet-pleasing increase in fuel economy. According to the EPA, the front-drive, V6-powered Jeep will now return 21 miles per gallon in the city and 29 mpg on the highway, up from 19 city and 28 highway. Four-wheel-drive, V6-powered Cherokees, meanwhile, will now return 20 mpg in the city and 28 mpg on the highway, up from 19 mpg in the city and 27 mpg.
With 271 horsepower, 239 pound-feet of torque and these newly enhanced figures, it's refreshing to see a larger, naturally aspirated engine that is still able to take the fight to today's crop of small-displacement, turbocharged four-cylinders.