I seem to see a trend that the 2005 and later KJs get better mileage than the 02-04 KJs. I did a little looking around on the net and noticed that the injectors for the two series are different part numbers. RockAuto.com has pictures of the two and there is a real difference in them. I am wondering if switching the earlier model injectors for the later would be of any benefit? Can it even be done? Here are the pictures of the two:

2005 Injector


2003 Injector
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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.