E-85 the C63
http://www.edmunds.com/mercedesbenz/...eview.5...html
I can truly imagine a huge benefit of running E-85 on our high compression ratio engines. In Brasil the Goverment has a patented designed of a electronic device called Flex-tek ( http://www.flextek.com/)
If you have any information on this I would love to hear from you.
In short, yes you will definitely need a tune and much more....




