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Ford GT racer sounds wicked during testing at Sebring

The Ford GT racecar is still deep in development ahead of a much-anticipated trip to the 24 Hours of Le Mans next year. If the sound in this clip is any indication, the honing of this racecar is going quite well. Like any proper racer, you hear the GT rumbling well before it enters frame, but then the beauty comes into view at Sebring with a massive rear wing and an even bigger diffuser. Rather than an ear-piercing shriek, the 3.5-liter EcoBoost in the GT sounds like a grumbling monster. The previous development video from Ford Performance hints at this angry exhaust note, but it's on full display here. Thankfully race fans around the world get to hear this wonderful noise when the GT hits the track next year. Two of them are competing in the United SportsCar Championship, and two more are in the FIA World Endurance Championship. All of the members of this quartet are also lining up at Le Mans, too. Hearing them making this wonderful growl together should be a major highlight of motorsports in 2016. Related Video:

Which is more fuel efficient, driving with a pickup's tailgate up or down?

Thanks to the smoke wand in the wind tunnel, you can actually see the difference in our video.
Should you drive with your pickup truck's tailgate up or down? It's an age-old controversy that's divided drivers for decades. Traditionalists will swear you should leave the tailgate down. Makes sense, right? It would seem to let the air flow more cleanly over the body and through the bed. But there's also a school of thought that argues trucks are designed to look and operate in a specific manner, and modern design techniques can help channel the airflow properly. So don't mess with all of that: Leave the tailgate up.

NHTSA closes probes on Jeep Grand Cherokee, Ford Freestar and Mercury Monterey

The Detroit News reports the National Highway Traffic Safety Administration has officially closed its investigations into 2012 Jeep Grand Cherokee, 2004-2005 Ford Freestar and Mercury Monterey models. The separate probes found no issues that pose safety concerns. NHTSA began investigating certain Grand Cherokee SUVs over complaints that power steering hoses could detach during operation, thereby increasing the risk of a vehicle fire. Of the 24 reports of failure, none alleged smoke or fire in the engine bay, and Chrysler has since modified the power steering cooler assembly to reduce the likelihood of the failure.
Meanwhile, certain Ford Freestar and Mercury Monterey vehicles garnered a government probe after receiving complaints that the models were equipped with faulty scissor jacks. The agency had received six reports of the jacks failing or causing injuries, including one incident that resulted in a fatality. But NHTSA says the jack failure rate is similar to those found in other vehicles. In those six cases, the government agency found the jacks were being used for something other than changing a tire, and investigators could not determine whether the emergency brake was set or the rear tires were properly chocked.