Parts of the country sell E85 fuel (85% alcohol, 15% gasoline) and growing corn seems more renewable than pumping oil. Could this be the way to extend the life of the internal combustion engine? That may be too broad for this thread. My question is: if you take a regular carb K5, what would it take to make it run on Ethanol/E85? Is it hard to also keep it Gasoline compatible? Does EFI make it easier or harder? I know that the big three all have EFI engines that run on any mixture of gas and ethanol. I think that it is mostly just a timing adjustment. Ethanol should give slightly more power, but less mileage. It is generally cheaper, though, where it is available.