swapping on the 99 intake on a pre 96 requires more work/parts (ie ps pump) ... i prob wont end up doing the swap even if my ps pump dies. but yes many have seen some results from it, others none.
im on stock gearing, auto, and from what i gather heavy 33x12.5 MTs (29lb 15" wheel, 65-70lb tire). i do almost all city ( < 70km/hr ) driving and have yet to see more 300km/tank (60 or 65L?)
ive recently installed:
- new performance header, down pipe, dynomax cat back. new o2, and rebuilt/flow tested upgraded 4 pintle injectors. running what looks to be a stock replacement cat.
regearing was a thought but im undecided yet. i was thinking of swapping out my 15" MT's for 16" All Seasons which could save me about 15-25% weight per wheel, which would help the mpg's a bit.
my jeep is currently my DD but will be a 2nd vehicle within 6 months, so im not crying too often about the gas milage - but it is terrible!