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On the floor at the SAE World Congress at Cobo Hall this week sits a 2.0-liter Tigershark engine. Parts have been cut away and there are pretty colored lights inside, but the cool part – if you're interested in biofuels, anyway – is how the engine has been modified to turn the Dodge Dart into an E85-capable machine.

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For those keeping score in the battle between advocates and opponents of higher ethanol blends in gasoline (fuels such as E15, which is 15 percent ethanol and 85 percent gasoline), chalk one up in the "advocates" column. Earlier this week, a US federal appeals court upheld last year's decision to allow public sales of E15 and denied a request from oil and food trade groups to look at possibly reversing the decision, Reuters says.

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Just when we thought that the horsepower battle between Ford Mustang and Chevrolet Camaro had reached its zenith with the 662-horsepower Shelby GT500, it appears that Chevrolet won't go down without a fight. Based on an official-looking Vehicle Identification Number decoder (click the above image to enlarge) that Camaro5 managed to get its hands on, the 2014 Camaro might be getting ready to receive a few tweaks under the hood.

Propel Fuels is acquiring $21 million in funding to add more than 200 fuel stations in new and existing markets over the next two years, offering more drivers E85 ethanol and biodiesel blends. The company currently sells fuel out of 31 existing retail stations in California and Washington, sharing gas pumps with gasoline and diesel.

The current and past presidents of Iowa Renewable Fuels Association were able to chat with Republican presidential nominee Mitt Romney on Tuesday, asking for his endorsement of the Renewable Fuels Standard (RFS) and ethanol. IRFA president Brad Albin and past president Walt Wendland approached Romney and put him on the spot while an associate filmed (watch it below). Romney's response? "I do support the RFS and ethanol." Albin works for Renewable Energy Group and Wendland with Golden Grain

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The battle over E15 – that mix of 15 percent ethanol and 85 percent gasoline – has apparently taken an unexpected turn.

Official

Here are the facts: currently, E15, the newly approved higher blend of ethanol (15 percent) in gasoline (85 percent), is only on sale at one fuel station in the U.S. That Kansas gas station, as we noted last week, requires buyers to purchase at lease four gallons of the fuel at a time, so as to prevent people filling up things like lawn equipment. Also, E15 has been called "probably the single most studied fuel in the history of EPA waivers," by Bob Dinneen, the CEO of the Renewable Fuels Associ

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A Phillips 66 gas-station in Kansas is the first in the U.S. to offer gas with a 15 percent blend of ethanol – aka E15 – to non-flex fuel vehicles, the New York Times reports.

Official

Putting E15 (a mix of 15 percent ethanol and 85 percent gasoline) on sale in the U.S. has been all but official since April, when the Environmental Protection Agency approved the first applications to make E15. Now, "all but official" has become official, with the EPA giving approval for retailers to start selling the biofuel. Just because stations can, though, doesn't mean that drivers will be able to get E15 right away. It will take time for the increased biofuel blend, made from corn ethanol,

Official

Putting E15 (a mix of 15 percent ethanol and 85 percent gasoline) on sale in the U.S. has been all but official since April, when the Environmental Protection Agency (EPA) approved the first applications to make E15. Now, "all but official" has become official, with the EPA giving approval for retailers to start selling the biofuel. Just because stations can, though, doesn't mean that drivers will be able to get E15 right away. It will take time for the increased biofuel blend, made from corn et

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For some drivers, ethanol-blended fuels such as E15 and E85 generate the same kind of confusion as stalactites and stalagmites do for high school geography students. Now, E15, which is fuel sold with a 15 percent blend of ethanol, is creating confusion all on its own.

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There are drawbacks to every kind of alternative to burning fossil fuels in our cars. Electric cars don't have enough range. Hybrids are burdened with what essentially boils down to two parallel powertrains. Hydrogen is limited to where it is available. Bio-ethanol has its own drawbacks, but don't tell that to the performance enthusiast. That's because E85 – similar to what IndyCars run on but mixed with 15 percent pump gasoline – is not only a renewable and cleaner source of energy,

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There are drawbacks to every kind of alternative to burning fossil fuels in our cars. Electric cars don't have enough range.Hybrids are burdened with what essentially boils down to two parallel powertrains. Hydrogen is limited to where it is available. Bio-ethanol has its own drawbacks, but don't tell that to the performance enthusiast. That's because E85 – similar to what IndyCars run on but mixed with 15% pump gasoline – is not only a renewable and cleaner source of energy, it also

Quick, which is easier to find: a public charging station for an electric vehicle or a station that offers E85? Despite the much larger number of flex-fuel vehicles on the road, it turns out that when you bring the fight down to electricity vs. ethanol, EV drivers have nearly a 2-1 edge.

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That falling ball in Times Square didn't just signal the end of 2011, it was also the death knell for thirty years of ethanol subsidies. That in turn could signal an abrupt rise in prices at the pump.

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Corn-based ethanol is a controversial fuel in its own right, and a long-standing government subsidy for blending the biofuel with gasoline has been an additional source of consternation over the last 30 years. The United States Congress wrapped up its work for 2011 without extending the incentive, a move that's drawn praise from environmental groups and taxpayer advocates.

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Burning ethanol in your car is supposed to be better for the environment, but when the company producing the biofuel falsifies air pollution monitoring data, things may not be as clean as they seem.

Since the summer, natural gas supporter T. Boone Pickens (pictured) has been in an energy fight with the Koch brothers. Think of it as a battle of the conservative billionaires to see who can get more money from the federal government.

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You would think something like defining a biofuel as an alternative to gasoline – something that seems so obvious a few years ago – would be a simple process. Turns out it's not. Did you know that E85, a blend of 15 percent gasoline and 85 percent ethanol, is not technically an alternative fuel? At least, it's not according to the tax code as defined by the Internal Revenue Service, and that's something that the Coalition for E85 is working to change.

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The ethanol industry is claiming victory with its stoppage of John McCain's (R-AZ) amendment to an agriculture appropriations bill that would've prevented the government from subsidizing E85 blender pumps.