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regardless of engine 3.6 or 4.0, the Down stream O2 isn't needed, just the Upstream O2 The only Chrysler PCM to actively control fuel pressure is a Hellcat/Demon. So that TJ 4.0 pcm should expect a static 55-58psi at the dead head fuel rail like most Chryslers. The easy way to regulate fuel to...

What's your end goal for maximizing MPG? If its "saving" money, then NOT spending on parts is worth a LOT in terms of imagined mpg "savings". Even NOT spending $50 is worth quite a few mpgs. If it's just for fun in general, what is the budget? Fuel injection running a lean 15.5:1 A/F closed...