I've got a 06 with a 6.0 (yeah, I know) and a SCT tuner on the performance setting. Around town, I get around 16, on the highway, I can get around 19 if I set the cruise and not get in a hurry. On the 65 hp tow setting, I get around 13 or 14 depending on terrain. That's hauling a deckover with a Jeep on it.
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