Not sure about the mileage, I think those that have the lpg setup get around 300 km out of a 80lt tank.
I would sit down and do some Maths work to see if its really worth the effort, especially now that LPG has gone uP to around 89cpl. I've been down this road before and cannot see the benefit let alone the value in it no matter from which angle you look at it. Just remember this, 89cpl is not your final price of what you pay to run your vehicle, as long as it takes for you to pay the LPG system off of around $5000 minus the $ 1250 rebate along and with the additional servicing you'll be paying around a realistic figure of about $1.35 a litre. Just a little food for thought before you shell out your hard earned on a vehicle that you originally paid $8500 for. But look, have a chat to those that have it and see what they say about it. I find my 4.6 uses less than the 4.5 litre 6 cyl petrol Landcruiser motor which is more advanced engine than the old Rover v8.

