I've been running Biodiesel in OKC for about a year and a half. I don't know of anyplace that pumps a biodiesel blend, but you can buy B100 in a 55-gallon drum from Hampel Oil distributors and they will deliver it. It is expensive though. 'The last time I bought some it came to over $4.00/gallon after taxes. If you just want to run B5, it might be worth your while to pick up some 5-gallon diesel containers at Home Depot or Wallyworld and drive to Dallas, buy some B100 and blend it yourself. BTW, the best D2 I have found in town is at Commercial Lubricators on Exchange. He prefilters it to 4 microns and takes extra steps to remove water. He also has Elf Excellium DID 5w40 motor oil (VW 505.01 compliant). I just picked up a case of it on Friday.