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Congrats on the birth!
Regarding the tunes, just start trying different things and keep a record of your mpg on a regular trip (to work and back for example). Just see what works best.
My 6.7 engine has the advantage of a VG turbo rather than the wastegate turbo on the 5.9 so that probably helps the smoke. Also, the 6.7 has an intake throttle that needs disabled/removed to avoid smoke issues with a lot of tuners. I don't think that the 5.9 has a throttle, but you might want to check.
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