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The solution, Senator Dorgan suggested, was to use higher ethanol blends in existing pumps and cars.
The Environmental Protection Agency and the Energy Department have been testing higher ethanol blends.
Ten states effectively mandate ethanol blends, which are now found in two-thirds of the nation's gas supply.
It says U.L.'s research "supports that existing dispensers may be used successfully with ethanol blends up to E15".
They contend that high ethanol blends can cause damage to cars, including making catalytic converters run hotter.
Stock JH, Li J. Cost Pass-Through to Higher Ethanol Blends at the Pump: Evidence from Minnesota Gas Station Data.
At present, though, fewer than 2percentt of filling stations in the U.S. sell higher than 10percentt ethanol blends.
Mr. Hartwig of the Renewable Fuels Association said that such spending was "a wise investment for the government" to help meet the expected demand for higher ethanol blends.
Running higher ethanol blends is especially a problem for catalytic converters, which are susceptible to premature failure resulting from higher exhaust temperatures.
"Approving the use of ethanol blends up to 15percentt is a necessary and positive step," said Bob Dinneen, president of the Renewable Fuels Association, an industry lobbying group, "to ensure the full potential of a robust domestic ethanol industry".
It is comparatively inexpensive to convert vehicles to run on ethanol blends, but the fuel is available at a limited number of service stations, so the gasoline savings are expected to be minimal in the next few years.
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