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Today, we take another look at ethanol for our weekly Greenlings post. You've probably noticed that many vehicles are labeled with a Flex Fuel badge from the manufacturer, indicating that the car or truck is capable of running safely on E85 – a blend of 85-percent ethanol and 15-percent gasoline.

Reader Sarah Turner emailed in a question yesterday asking about the Stirling Engine and what might come be it’s future as a power source in automobiles. Since this is an excellent topic that, I think, will interest a lot of AutoblogGreen readers, I’m re-asking the question here. If you’ve got any knowledge about this, post it in the comments.