A couple years ago when I was commuting from Bournemouth to Kent twice a week. I bought an elderly S-type that had been converted twice previously. It started life with a BRC kit and then about 18 months prior to my purchase it was re-converted with a Stag kit. On the run to kent I was getting 25mpg which was an equivilent of 50mpg when you took into account fuel costs 60p lpg vs 120p petrol, always felt better on lpg too. Was a complete bargain for £750 with a years mot too. Did me good for a couple of years. Only sold due to moving to a rural location and needing to lug large equipment around. Lovely comfortable place to be. I could have got 50mpg in a mirca. But would have had the bonus of severe backache. I will say the fly in the ointment was finding lpg stations although the app filllpg on android was really good. Used location etc. Oh and the lpg fuel gauges are just crap. Always have to gauge from the mileage yourself.