E10
In 2008 the German Federal Department of the Environment put its plans to increase the part of ethanol added to the gasoline to 10% in 2009 on hold. It was said that more than three million cars in Germany were not compatible with the increased ethanol part. But in reverse this meant that more than 20 million cars could be fueled with E10 without any problems (please see below for press releases of the manufacturers). At E85 filling stations drivers can mix an E10 on their own by admixing the suitable amount of E85 to the regular 91/95 octane gasoline. Doing this, the savings are a lot higher than with "pure" E10 because a liter of E85 currently costs approximately 0,93 €.
Download press releases of E10 clearances by several manufacturers (PDF-file)
In the USA E10 is a standard fuel already and all major manufacturers have given clearances for their cars.
Download manufacturer's clearances USA (PDF-file)
Certain component suppliers have given clearance for their parts, too.
Download material compatibilty list (PDF-file)