BIO or non BIO fuel ?

The problem is that every station and every fill-up MAY be different. Read closely what the labels say. They usually use terms of "up to 20%" or "up to 5%".
The same goes with gasoline where they say that the fuel MAY contain "up to 10% ethanol".
I guess this allows the suppliers to mix loads and that you may have the full percentage of bio but in all probability you will have something less than the full amount stated.