Alright, since this is a new vehicle I figured I'd get the alignment checked...they said it was within spec. So asked them to 0 it out. They told me it would probably cause tire wear and even put it on the paperwork that I acknowledged it was a possibility. It has crappy wal-mart tires on it from the dealership so I'm not too worried. If it starts wearing too bad I'll have it re-aligned before getting the LRR tires.
From a little driving around I will say it seems to have helped in coast downs. From one light I'd normally be at about 14mph at the next light, today I was at 21mph by the time I reached it. Unless I'm just crazy, which is possible. :P
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