I had my Rangey converted here in New Zealand and it is worth it but the MPG we are getting on LPG is crap compared to on petrol...... Any reason why Jonny? The guys that done it told us it would run 1 to 1 with petrol consumption.

My brother in law also has same 4.4 Vogue Rangey and on some journey we ran his on petrol mine on gas, his used about 37 litres of petrol and mine used 46 litres of LPG.

LPG costs $1 a litre here so I was $46
Petrol is around $1.70 so he was $62.90

So if MPG was the same the difference would be huge!!!