I sat through several presentations on ethanol this spring at the SAE congress. The two of them came to the same conclusion, E85 is too much for a vehicle that also has to be able to stomach straight gasoline. Both companies testing showed that E35 to E40 was the breaking point based on cost and fuel economy. If you want to run higher ethanol content than that and get the most benifit from it, then engine design needs to change (compression ratio, combustion chamber shape, etc).
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