By "biofuels" I assume only E10; anything else just won't really work.
It's difficult to get consistent and accurate information as an outsider. So, we need to go inside.
In Michigan, and only Michigan, E10 at the pump NEED NOT BE LABELED AS SUCH. That's the law, you can read it on the state's website.
http://www.michigan.gov/dleg/0,1607,7-154-25676_25753_25757-83812--,00.html My neighbor owns an oil and fuel distribution company in a suburb here; and they are BP distributors. They tell me that for some time now ALL gasoline (excepting specialty fuels such as avgas, racing fuel, marine gas etc.) for road cars is E10. I think BP was one of the last to change over. I can't verify this, but labeling law aside, I have NOT seen a gas pump around here that IS NOT labeled "CONTAINS 10% ETHANOL". I have not seen any stations advertising "ONLY PURE GASOLINE" like BP used to. I guess I've been using E10 for the past couple of years. Not by choice but only by availability.
It is less costly to "pump up" the octane rating with a small quantity of ethanol than with petroleum octane. That's one reason why it is used. Claims about renewable energy, etc. are another.
I don't know what to make of it: I do know that I don't look anymore because you can't really find E ZERO which is what MB is suggesting for our old cars.
