be very careful with any bio-diesel fuel (B10 or above). Been there and did the repairs and it's not cheap, even if you do it yourself like I did.
Anything above B10 will grow algae in your fuel tank if it sits for a prolonged time and the algae will compromise your fuel system, clog filters and wreak havoc on your wallet.
I've actually become paranoid because of my experience so I add a bio-cide now. I use Power Kleen (made by Powerservice) when I store my unit over the winter.