Spiegel: Germany’s enthusiasm for biofuels is in question this week after estimates were released that well over a million vehicles on German roads would be unable to run on gasoline containing a higher mixture of bioethanol. Environment Minister Sigmar Gabriel had planned to introduce a requirement that gasoline sold in Germany contain 10 percent green ethanol made from plants, a mixture known as E-10. But he said in an interview with the Stuttgarter Nachrichten that, should more than 1 …