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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 hurt by 2015 F-150 production restraints

The new 2015 Ford F-150 came out of the gate strong for January 2015 with all F-Series sales up 17 percent for the month. However, February tempered those gains a bit with the model line dipping 1.2 percent, and the Ford brand itself dropped 1.7 percent year-over-year. The fall is being blamed in part on tight supply of the latest pickup. A major factor holding back the 2015 F-150 is that they are only currently being made at the Dearborn Truck Plant. The Kansas City factory is still changing over, and full supply from them both is expected by the middle of the year. Ford also just announced plans to hire an extra 1,550 people to build the pickups, including 900 in Kansas City. However, the downtime in the assembly changeover has caused about 90,000 units in lost production since mid-2014, according to The Detroit Free Press. It's not all bad news for the pickup, though. The latest F-150 made up 21 percent of F-Series sales in February, according to The Detroit Free Press, up from 18 percent in the previous month, and they remained on dealer lots an average of 18 days. The lessened supply has also meant lower incentives. Mark LaNeve, Ford's US marketing boss, told the Free Press that average F-150 transaction prices were up $2,000 from last year. He also indicated that retail figures grew seven percent in February, while F-Series fleet numbers were down 18 percent. The constrained supply does come at an inopportune time for Ford, though. This year is expected to be huge for pickups. Also, lower gas prices appear to be pushing people towards SUVs and trucks recently. Related Video: