I'll have the O2 in there anyway, so may as well feed it back, then its up to the tuner what he wants to do with it.
If I want to run E85 I need multiple maps - it's not that plentiful over here in SA, and I do take it into the country. Can't to Adelaide to Melbourne on E85
We'll see how it goes. Everything will be in place for the tuner to use what he wants and ready for a bigger turbo later!