BMW on Tuesday released fuel-economy and pricing details for its upcoming diesel versions of the 3-series and X5. The diesels will be shown at the Los Angeles auto show next week, ahead of their launch in the U.S. market.

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Remember the 524td? It was the last diesel-powered car that BMW offered here in the U.S., and it was new about 20 years ago.

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purchasers of VW's new clean diesel-powered Jetta for 2009 would be eligible for a tax credit of $1,300, and now more models from Germany get the same treatment from the Internal Revenue Service.

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Starting in 2010, owners of diesel-powered cars and trucks may have to fill a supplementary tank with urea, an organic compound that fights nitrogen oxide emissions when it's injected into a vehicle's exhaust system.

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The arrival of a new kind of diesel fuel might not be terribly breathtaking to most people, but it's being called the biggest development in auto fuel since they took lead out of gasoline.

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