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I've been messing with the truck of late, but the GP could really use this. MY wife doesn't speed to engage a higher gear for lower rpms (she does coast a lot, and not accelerate fast) so she tends to net about 1mpg less than I (although I might be able to do better, as I have a slightly heavier foot than her). With the lock she could lock it in 2nd or 3rd for the majority of speeds she drives; and I doubt a switch would be out of her range of driving skill.
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