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It's not an easy time to be a biofuel promoter. Plug-ins are getting all of the automaker and government support, and lingering questions about biofuel's impact on the environment and food prices can have people shying away. When it comes to biodiesel, dealing with different levels of the plant-based fuel in the petroleum and questions about OEM warranty issues can impact a person's or fleet's decision whether or not to use B5 or B20 or B99 or stick with straight petroleum.

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The British supermarket chain Morrison's sells B30 - petroleum diesel with 30 percent biodiesel blended into it - at 113 pump stations in their supermarkets in the United Kingdom. However, switching to B30 might not be advisable for some motorists, and there are still worries that the biofuel could void the car's warranty. Currently, only PSA engines, sold under the Citroën and Peugeot marques, explicitly allow drivers to fill up with B30 without voiding the warranty. 15 other brands - Audi

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Most manufacturers, including heavy-hitters like Volkswagen and Mercedes-Benz, allow the use of a 5 percent biodiesel blend (aka B5) without violating the terms of the car's original factory warranty. What happens if you use a higher biodiesel concentration? That's a good question, and the answer isn't particularly clear at the moment. According to Steve Keyes, Volkswagen's director of public relations, "All Volkswagen TDI models are warranted for the use of up to a B5 blend. Blends of biodiesel

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