1985 Ford Bronco U100 on 2040-cars

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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 Mustang GT Bi-Fuel CNG

Highly intrigued, we recently visited a Southern California Gas Company office to check out several hybrid vehicles promising something new. Unlike more commonplace gasoline-electric hybrids, we were there to evaluate innovative gasoline-compressed natural gas (CNG) hybrids - yes, they run on unleaded gasoline and compressed natural gas. According to the experts on hand, this arrangement delivers extended range and reduced emissions while chipping in with lower operating costs than pure-gasoline vehicles. There are advantages over its gasoline-electric counterparts, as well.
The program is part of a three-way collaboration between The Carlab, a Southern California-based automotive consulting firm, Landi Renzo USA, a company specializing in alternative fuel solutions, and America's Natural Gas Alliance, a group that promotes CNG. Long story short, the team has engineered a way to allow a modified internal combustion vehicle to seamlessly switch between two fuels (gasoline and CNG) with no driver intervention. In theory, and if it works as well as promised, it's a win-win for the vehicle owner and the environment.
Parked at the Gas Company office were six different gasoline-CNG hybrid vehicles. To demonstrate the technology's versatility (just about any gasoline vehicle may be modified) Carlab brought a varied assortment of bodystyles, each from a different automaker. After taking a quick glance at the half-dozen in the parking lot, we made a beeline for the performance-oriented Ford Mustang GT - a 2012 model - with the six-speed manual gearbox.

Here are the best-selling cars and trucks from January 2015

Every month, Autoblog slogs through all the sales figures reported by automakers that do business in the United States, and, after a little bit of sorting, we put it into an easy-to-read chart in an attempt to make it as easy as possible to follow the ins and outs of sales and shipments. But that only covers the brands themselves, not the individual models they sell. And we think you'd all be interested in knowing which vehicles beat their rivals in sales from month to month, so we've put together this handy gallery to keep you in the know. While the leader of the pack may not come as much of a surprise, the order that the top ten finishes in changes frequently – due to automaker deals, the price of gas, etc. – and we've included some statistics to help you see how their current performance stacks up to month's past. Click here to see January 2015's Top Ten Best-Selling Cars And Trucks In America. By the Numbers Chevrolet Ford GM Honda Nissan RAM Toyota Car Buying