| I had LPG fitted to my last Jeep Cherokee 4.0L (a single-point system which they say the Jeep's engine is perfectly suited to) by an approved LPG installer. The garage was also an approved service center for the local Chrysler / Jeep dealership.
Now, I'm sorry, but I personally found it a complete waste of time and would recommend it to nobody. For a start, LPG stations are few and far between. When you find one, there'll only be one pump, so if someone is there and the rest of the station is free then you have to sit and wait (looking like a tit). Also, I found it very common for the pumps to be out of order at the various garages I visitied in Scotland and North East England. I also experienced a few backfire and starting problems with the Jeep (apparenty a problem a lot of people experience), meaning I would have to sit there revving it for 20seconds EVERY time I started the engine to avoid it cutting out / backfiring. The garage say that's a characteristic and can't be helped.
Finally, resale value will be severly hampered. No one wants to buy a 2nd hand LPG converted car (especially if you lose the whole boot on the mini).
P.S: Scooper ended up blowing his engine shortly after his LPG conversion. I remember the installer posting on here asking for help!  | 
