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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.

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.

Stocks down as automakers, Boeing lead China's hit list in trade spat

Shares in U.S. exporters of everything from planes to tractors fell on Wednesday after China retaliated against the Trump administration's tariff plans by proposing duties on key U.S. imports including soybeans, beef and chemicals. U.S. automakers' products are prominent on China's list of tariff targets, yet shares of automakers ended higher on Wednesday as Wall Street stocks changed course in the afternoon when investors' trade fears subsided. Tesla shares closed 7.3 percent higher at $286.94, Ford shares gained 1.6 percent to close at $11.33, and GM shares were up 3 percent at $38.03. Aircraft maker Boeing closed down 1 percent, weighing the most on the Dow Jones Industrial Average as documents from China's Ministry of Commerce and the U.S. manufacturer showed the move would affect some older Boeing narrowbody models. It was not immediately clear how much the tariffs would impact its newer aircraft. Boeing said it was assessing the situation while analysts from JP Morgan said the proposals from China looked to have been calibrated carefully to avoid a major impact on the planemaker. Fellow Dow component 3M lost as much as 2.4 percent. And farming equipment maker Deere lost nearly $10 per share at its lowest. The company urged the two countries to work toward a resolution to "limit uncertainty for farmers and avoid meaningful disruptions to agricultural trade." The speed with which the trade spat between Washington and Beijing is ratcheting up — the Chinese government took less than 11 hours to respond with its own measures — led to a sharp selloff in global stock markets and commodities. China was hitting back against U.S. President Donald Trump's plans to impose tariffs on $50 billion in Chinese goods with similar tariffs on U.S. goods even as Trump said the country is "not in a trade war with China." "Everybody knew they were going to retaliate. The question was how strong of a retaliation. Today's move clearly shows that they mean business," said Adam Sarhan, chief executive of 50 Park Investments in New York. China levied 25 percent additional tariffs on U.S. goods, but unlike Washington's list that covers many obscure industrial items, Beijing's covers 106 key U.S. imports including soybeans, planes, cars, whiskey and chemicals. Trump denied that the tit-for-tat moves amounted to a trade war between the world's two economic superpowers.