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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.

Signature Edition Ford Shelby GT500 Super Snake to get limited production run

The upcoming Ford Shelby GT350 Mustang keeps grabbing a horde of headlines thanks in no small part to the pony car's 5.2-liter V8 with a flat-plane crankshaft, magnetic dampers and other go-fast goodies. However, as the new contender enters the ring, Shelby American is saying goodbye to the old GT500 and the company's even more powerful Super Snake version with its new Signature Edition model. Limited to a total of 50 conversions on 2007-2014 coupe or convertible GT500s, the Shelby American Signature Edition packages some of buyers' most common choices into a single vehicle with a few extra touches, as well. The heart of it all is a 3.6-liter Kenne Bell supercharger to replace the V8's standard blower and take power up to a claimed 850 horsepower for the latest models. To keep things running at the proper temp, the mill gets an upgraded radiator, heat exchanger and aluminum cooling tanks, too. The rear brakes are also improved to slow this stallion down. In addition to the boosted power, buyers get some extra style. These special Super Snakes are available in all of the colors available on them from Ford, plus a range of shades for the stripe, and the wide body package can also be added as an additional option. The limited version wears 20-inch forged wheels from Weld that are 9.5-inches wide at the front and 10.5-inches at the rear and feature Signature Edition center caps. Inside, there's a commemorative badge with Shelby's signature on the airbag cover and Signature Edition floor mats. Finally, customers get a day training at the track to learn how to control this beast as part of the package. Orders for the Signature Edition are being accepted through January 31, 2015, and the modded model is priced at $44,995.00, which is in addition to the price of the stock GT500. Read below for Shelby American's full announcement of this limited Mustang. SHELBY AMERICAN'S SIGNATURE EDITION GT500 SUPER SNAKE PACKAGES TO HONOR FINAL 2007-2014 MODEL YEAR CARS NEWS RELEASE FOR IMMEDIATE RELEASE · Shelby American to offer 50 total Signature Edition Ford Shelby GT500 Super Snakes · Special badging and stripe colors offered for every model year for first time in history · Offer expires January 31, 2015 LAS VEGAS – Dec. 20, 2014 –Shelby American, a wholly owned subsidiary of Carroll Shelby International Inc. (CSBI:PK), has unveiled a Signature Edition Super Snake package to honor the end of production for the current generation Ford Shelby GT500.

Recharge Wrap-up: Nissan earns Energy Star award, ethanol production forecasts adjusted

The US Energy Information Administration has adjusted its ethanol production forecasts. It predicts an average of 944,000 barrels per day for 2015. That number is up from 2014 production levels of 935,000 barrels per day, but it is lower than last month's projection for 2015, which was 947,000 barrels per day. The EIA forecasts 937,000 barrels per day in 2016, down from its prior forecast of 942,000 barrels. Biodiesel production averaged 83,000 barrels per day last year, with projections of 82,000 for 2015, and 84,000 for 2016. Read more from Ethanol Producer Magazine. Boston Mayor Martin J. Walsh supports the proposed Diesel and Vehicular Emissions Ordinance. The ordinance, filed by City Councilor Stephen Murphy, would require emissions control retrofitting of all pre-2007 vehicles belonging to the City of Boston, as well as those of any contractors it hires. The ordinance also seeks to create a simple city-level standard of enforcing the state's anti-idling laws. "The asthma rate in Boston's neighborhoods continues to climb," says Councilor Murphy. "By further tightening air quality standards, as this ordinance does, we will make Boston's neighborhoods healthier." Read more at DieselNet. The Michigan Blue Economy report profiles Ford for its water-saving sustainability efforts. The report notes that Ford reduced its water use by 61 percent, or 10 billion gallons, from 2000 to 2013 by "cutting the water used in everything from cooling towers to paint operations." As part of its Global Water Management Initiative, Ford has decreased its total water use at its facilities worldwide from 64 million cubic meters per year to 25 million cubic meters. Read more from Ford, or at the Michigan Blue Economy website. The EPA has named Nissan an Energy Star Partner of the Year for the fourth year in a row. The automaker received the Sustained Excellence Award for its efforts to reduce energy use and greenhouse gas emissions in its operations. Nissan reduced the amount of energy used to build vehicles by 13 percent in 2014. Energy reduction efforts include switching to LED lighting and developing an environmentally friendly paint process. Nissan also works with schools in Tennessee and Mississippi to help them reduce energy usage. "Since this initiative began in 2012, we've helped about 30 schools make the esteemed Energy Star certification list," says Nissan's John Martin. Read more in the press release below.