I just purchased three 55 gallon drums of B100 and mixed some of it into my regular tank on Thursday night to produce B20. The BD was $.25 cheaper per gallon than regular diesel so I'm also saving a little cash. The engine sounds quieter, has no apparent loss of power and got .5 mpg better on the first tank. This truck runs just under 600 miles per day, so I've got pretty consistent records to compare to. After several tanks of B20 and a new fuel filter, my plan is to start increasing the BD % to B50. I'll keep everyone posted.