ahh... well... i would think folks would want this just to get rid of the smell that diesels make... personally i LIKE the idea of a fuel that helps my psd run smoother... last longer... run cleaner.. and it lubes the fuel system better.. but.. i am taking people at their word that this is the case as i haven't had a chance to run it yet... has anyone in here run bio..? if so.. what did you run, what did it cost, and what where the differences you noticed if any..?