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How far is your commute roundtrip, and is it roughly 5 days per week? If you're lookin to save money, lets start with those figures.
Regarding tuners, I've anecdotally heard some people claim improved economy for electronic injection turbo diesel trucks, but I don't have personal experience. I imagine a gasser tune could see some improvement too, especially if emission stuff is ignored such as elimination of the rich/lean dance. My guess is the improvement in efficiency would never offset the cost of the tuner.
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