My local fuel station has a pump with B20 (soy) and it's only .02 more than the regular diesel. I've read on here that at a 2% blend the lubrication properties are great. You also can't buy much of any good brand name fuel treatments for .02 a gallon. So for .02 extra I was going to try a tank and see if I could see any difference. I know the 6.7's can run B20 from the factory just didn't know about the 6.4's. It's a 2010 all stock (hopefully not for long).