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I believe the 5.9 gets better mileage because of the lack of most emissions parts found on the newer 6.7. But anyhoo, I would definately go diesel.. and this is NOT comming from a "diesel head" (yet!). Im looking for a CTD to replace my gasser as a DD.. figured Id save around 1500/year driving the diesel as opposed to the gasser. Hope I helped you a little, and Im sure some more guys with better answers can/will chime in!
