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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 finds flex-fuel engine design plays big role in emissions output

How bad is ethanol for your engine? There's been a lot of debate on this issue as the US considers upping the biofuel content in the national gasoline supply from 10 percent (E10) to 15 percent (E15). The ethanol industry and some scientists say higher ethanol blends show no "meaningful differences" in new engines while the oil industry says ethanol creates health risks. Researchers working at the Ford Research and Innovation Center decided to take a closer look at how a wide range of gas-ethanol blends - E0, E10, E20, E30, E40, E55 and E80 - affected the emissions coming out of a flex-fuel 2006 Mercury Grand Marquis. To see the full report, printed in the journal Environmental Science & Technology, requires payment, but there is an abstract and Green Car Congress has some more details. The gist is that, "with increasing ethanol content in the fuel, the tailpipe emissions of ethanol, acetaldehyde, formaldehyde, methane, and ammonia increased." At least NOx and NMHC emissions decreased. The researchers say that the effects are due to the fuel and "are expected for all FFVs," but that the way that a manufacturer calibrates the engine will affect NOx, THC, and NMOG emissions. It's this last bit that's important, since the researchers found, "Higher ethanol content in gasoline affects several fundamental fuel properties that can impact emissions. ... These changes can have positive or negative effects that can depend on engine design, hardware, and control strategy. In addition to direct emissions impacts, higher ethanol content fuel can also provide more efficient combustion and overall engine operation under part-load conditions and under knock-limited higher-load conditions." So, as we head towards more ethanol in our fuel supply (maybe), manufacturers are going to need to learn how to burn it most efficiently.

Ford Focus PHEV on the way?

A refreshed Ford Focus is in the works and that means a few details are leaking out. Spy shots from last month indicated the Focus will have a gaping grille just like its "One Ford" global C-segment comrade, the Fiesta. While Ford is being quiet about it, the Focus could also be getting an "Energi" option, joining the C-Max Energi and Fusion Energi in Ford's plug-in hybrid family. The Focus will likely use technology originated in the C-Max Energi that combines a 2.0-liter gasoline engine with an electric motor capable of a 20-mile range, according to Autoexpress. The pure electric Focus is expected to stay in the lineup despite its slow sales; its price range should be similar to what's on the market now. The third-generation Focus looked good enough to become the top-selling nameplate in the world in 2012. Some exterior changes to look for in the Euro-spec model at the Geneva Motor Show in March include a reshaped hood, front wing endplate and rear bumper. Interior spy shots have hinted at an updated dashboard design and a simplified, less cluttered control panel with updated climate controls. Under the hood, there are quite a few power options rumored to be available - a gasoline EcoBoost with up to 123 horsepower and two turbo-diesel TDCI options, a 1.6-liter or 2.0-liter mills that would produce between 94 hp and 161 hp. Then there are new 1.5-liter diesel and 1.5-liter EcoBoost gasoline variants that meet regulations in China, Brazil and Russia.