Just added 3 gallons of B99 to the remaining 5-6 gallons of petro diesel in my tank. 05 CRD with 149,700 miles on it (all petro-diesel, I presume).
Have a secondary fuel filter (a 3 micron Donaldson P551313) added, and am carrying a spare Wix/stock primary filter.
For those in, or traveling through, Asheville, NC there is a longtime commercial producer
http://www.blueridgebiofuels.com/They have dropped to only one pump, which is not far from Interstate 40. The pump has B99 until the end of September, then it has B20.