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Well, propane is probably cheaper than diesel now. the systems are expensive so it may take a long time to recoup your investment. My Friend has one and his truck hauls serious a$$ when it's turn on. even if the HPOP can't keep up with a tune the propane can still add fuel. the tanks take up a lot of room in the bed.
You can do a forum search using the keyword propane and you will get 840 different threads talking about propane..My PSR diesel magazine has alot of positive to say about the subject however..