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American automakers fall in latest Fortune 500 rankings

Not that it means anything beyond bragging rights, but if you're fixated on the positions of domestic automakers on the annual Fortune 500 list, both General Motors and Ford are still on it but they've slipped a couple of notches. The list ranks American companies and they're ordered solely by revenue. GM, fifth last year, came in seventh, while Ford fell from ninth to tenth even though both companies saw small gains in annual revenue.
GM's $152.3 billion in revenue was less than a third of that of the first company on the list: Wal-Mart, which regained the title from Exxon Mobil. Berkshire Hathaway and Apple are the firms that moved GM down. Ford, displaced by energy company Valero, had $134.3 billion in revenue.
On a side note, profitability isn't a factor, but both GM and Ford were down in this year's list compared to last year's: GM declined from $9.2 billion to $6.2 billion, Ford fell from $20.2 billion to $5.6 billion. If profits were included, Exxon Mobil would probably still be king: although the energy company made almost $20 billion less in revenue than Wal-Mart's $469.2 billion, it posted $44.9 billion in profit compared to Wal-Mart's $17 billion.

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.

Recharge Wrap-up: Tesla considers Model III SUV and wagon, Ford tears Tesla apart

Worries over Brazil's electric grid mean EVs are excluded from green car incentives. As part of a new efficiency program, non-plug-in hybrids will be eligible for a reduction in import duties, while EVs and plug-in hybrids will not. Brazil's government is concerned that the country's grid lacks the capacity to handle the increased load from an influx of EVs. Brazil plans to create a new incentive program - perhaps a more inclusive one - when the current one expires at the end of 2015. Read more at Green Car Reports. Tesla could make SUV and wagon derivatives of the upcoming Model III sedan. Tesla's VP of engineering, Chris Porritt, told Auto Express that to reach as many customers as possible, Tesla would consider all its options. "SUVs, estates - who knows?" says Porritt. He also says that while the company is currently focused on products with a broader appeal, another Roadster or other sports car aren't out of the question in the future. Read more at Auto Express. Ford admits to a Tesla Model S teardown. Ford CEO Mark Fields says that after disassembling, reassembling and driving the model S, his company is "very familiar with that product." He also says the Ford has the capability to build a similarly high-tech, long-range electric car. The questions still remains if Ford has plans for such a vehicle, but Fields says that it fits within Ford's "product philosophy." Read more at Business Insider and at USA Today.