ok... I tell you how much cost it in poland. I check it now and one dolar cost 2.78 zł. My XJ takes ~13 l/100km. 1 l gas cost 4.30 zł (1,54$)=55.90zł(20.10$). 1 galon US = 3,78 litra 1galon in poland = 5.84$
Like you see Jeep isn't in poland ecenomic car. Many of Jeep's users have LPG instalation when want reduce cost travel.
Here I want find information about modification suspension. You have nice XJ's and I think i find something. It's a pity, price of parts in Europe isn't small and this is a problem. Pozdrawiam was