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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.

Ford Police Interceptor with 2.0L EcoBoost rated most fuel-efficient police sedan

Back in September, Ford announced a non-pursuit version of its Police Interceptor Sedan, which swaps out a choice of two V6 engines for a fuel-efficient 2.0-liter EcoBoost inline four-cylinder. This Special Service Police Sedan will be marketed to law enforcement agencies looking to cut fuel costs and don't need the extra power.
For college campuses, detectives and the like, this new police car has now been certified with EPA fuel economy estimates of 20 miles per gallon in the city, 32 mpg on the highway and a combined rating of 24 mpg. These figures represent a decrease of two mpg in city and combined ratings compared to the civilian-spec 2014 Taurus. These police cars still offer active grille shutters for better aerodynamics, although we're guessing agencies upfitting their cars with light bars and push bumpers aren't exactly concerted with aerodynamics. The true benefit of the SSP version is when it's compared against other police sedan options like the Dodge Charger, Chevy Impala, Chevy Caprice and even the V6 Police Interceptor Sedan.
Ford claims the new Police Interceptor Sedan SSP is the most fuel-efficient current option for police departments, saying that this car can save $1,720 per car over three years and almost $260,000 over the same span of time for fleets with 150 vehicles. There is an official press release posted below, and also check out the gallery of images from Ford collected from various police agencies across the US (although none show the 2.0-liter SSP model). Head on over to Ford's Police Interceptor mini-site for even more pictures of the Police Interceptor Sedan and Utility.

Next Lincoln Navigator to drop V8 in favor of V6, but Ford Expedition might get both

A great many buyers fled from full-size body-on-frame SUVs to car-based crossovers in large measure to save fuel. But that doesn't mean there's still not a buying audience for more traditional truck-based utility vehicles, and those consumers doubtlessly wouldn't mind saving some dollars at the pump, too. According to Motor Trend, those shoppers might be in luck.
That's because the magazine has confirmed that Ford isn't walking away from the full-size SUV segment, and it's poised to do something about its offerings' economy ratings, too. According to MT, global Lincoln director Matt VanDyke has hinted that the next Navigator may drop two cylinders and go with a V6 model - the current model gets just 14 miles per gallon in the city and 20 on the highway from its 5.4-liter V8. The obvious fitment would be Ford's 3.5-liter twin-turbo EcoBoost V6, an engine that has spread like kudzu throughout the rest of the Blue Oval's large vehicle lineup.
Downsized turbocharged engines like Ford's EcoBoost franchise have come under fire as of late for not delivering their EPA fuel economy ratings, but their benefits extend beyond consumption - the 3.5L offers superior power and a better torque curve than the naturally aspirated V8. MT also suggests that Ford's 3.7-liter V6 could form the base engine for the next Navi - it has similar horsepower but a lot less torque than the current 5.4L. That may be less of a problem with the next generation tipped to go on a diet, which could level the playing field somewhat.