Got a 2007 5.9 and looking to go hippie and use b20 or straight veggie/ bio if it's financialy worth it, to add to regular ULSD. I was trying to do some internet searching and it seems like that option is a little more difficult to come by than I thought as far as buying it straight from a station. it looks to me that a few places that used to sell it in the Denver area are no longer in service. Does anyone have advice on where I can get b20 or get help on using straight vegetable oil...! It's just weird to me since there are so many hippies in Colorado that are worried about the environment yet there are so few places that I can do this... I just figured running on vegetables rather than natural oil would be a huge thing around here......