I have a 2010 Unlimited that I just picked up a couple weeks ago. I kept the superchips flashpaq from my 08, and have already re-calibrated the speedometer for tire size. The engine has 900 miles on it, is it too soon to re-tune it for 91 octane? I've ran 3 full tanks of 91 through it already.

 

There's no reason to wait. But there was no reason to put 91 in it those last 3 tanks, either.