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my JB3 milage went up on the highway... Naturally around town I am in the gas more than not... but I took a ~600 mile trip with the jb3 and got about 2mpg better than OEM programming... albeit, it was cooler this time around.
Anyway, install the chip, drive the car... I noticed more power after the second day on a cold start... might have just been all in my head though.
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