I was just talking to a heavy duty mechanic buddy an he said thats what he was told in trade school. I asked him if he had ever tried it and he said he has only ran desiels ever since he started in the trade. The other point he was told was one moth ball in a tank boosted the octane to a certain point but two wouldn't boost it any more. Any one out there tried it? I know it is a big leap of faith after a turbo investment but I am intrested.