The amount of stop-and-go driving you do is the criteria on which I'd base my decision. What you mentioned in the first post is usually how it goes.
We typically discourage paying for both DD calibrations as you'll end up only using one if you don't make a conscious effort to change the tunes for each type of driving.
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Tuning, PCM flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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