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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.

Jay Leno sees how the other half lives with CHP cop cars new and old

Comedian Jay Leno is changing gears from driving fast cars to checking out some of the police cruisers that regularly chase down and dish out punishment to those fast cars. In this episode of Jay Leno's Garage, we get the lowdown on the modifications made to the Ford Explorer for the Interceptor package (which looks pretty tough in its California Highway Patrol livery).
The new Ford is cool, but cooler still are the pack of classic CHP cars that Jay has along for the episode. A 1982 Mustang, 1966 Dodge Polara, 1970 Mercury Monterey and 2000 Crown Victoria are all in the shop. Better still, Jay lays out an argument for ones of the classic cruisers as the best cop car of all time. Get your guesses in now, and then scroll down to watch and learn.

2015 Ford Mustang EcoBoost already hitting 12-second quarters

The arrival of a new Ford Mustang means many things to many people, but not least of them is drag racers. The pony car has always been a mainstay of the drag strip, and the Ford Racing team aims to carry that reputation forward with this latest generation. So it cooked up a few basic modifications on three new 'Stangs and headed to the strips at US 131 and Milan Dragway to see what they could coax out of 'em.
Impressively, the 5.0-liter V8 Mustang GT with a few modifications (but no forced induction) managed to clock a quarter-mile time of 11.77 seconds. Another Mustang GT fitted with a supercharger clocked a blistering 10.97 seconds. But just as intriguing was the modified EcoBoost model that, with only four cylinders and 2.3 liters of displacement, still passed the gates in just 12.56 seconds - nearly half a second better than expected. This with modification limited to a new subframe, half-shaft, drive shaft loops, exhaust, engine calibration, slicks, roll cage and bucket seat. Well done, boys.